diff --git a/src/atom.cpp b/src/atom.cpp
index a53f35d7b3..1f5d5a80c4 100644
--- a/src/atom.cpp
+++ b/src/atom.cpp
@@ -455,8 +455,8 @@ void Atom::create_avec(const char *style, int narg, char **arg, int trysuffix)
 
   if (sflag) {
     char estyle[256];
-    if (sflag == 1) sprintf(estyle,"%s/%s",style,lmp->suffix);
-    else sprintf(estyle,"%s/%s",style,lmp->suffix2);
+    if (sflag == 1) snprintf(estyle,256,"%s/%s",style,lmp->suffix);
+    else snprintf(estyle,256,"%s/%s",style,lmp->suffix2);
     int n = strlen(estyle) + 1;
     atom_style = new char[n];
     strcpy(atom_style,estyle);
@@ -487,7 +487,7 @@ AtomVec *Atom::new_avec(const char *style, int trysuffix, int &sflag)
     if (lmp->suffix) {
       sflag = 1;
       char estyle[256];
-      sprintf(estyle,"%s/%s",style,lmp->suffix);
+      snprintf(estyle,256,"%s/%s",style,lmp->suffix);
       if (avec_map->find(estyle) != avec_map->end()) {
         AtomVecCreator avec_creator = (*avec_map)[estyle];
         return avec_creator(lmp);
@@ -497,7 +497,7 @@ AtomVec *Atom::new_avec(const char *style, int trysuffix, int &sflag)
     if (lmp->suffix2) {
       sflag = 2;
       char estyle[256];
-      sprintf(estyle,"%s/%s",style,lmp->suffix2);
+      snprintf(estyle,256,"%s/%s",style,lmp->suffix2);
       if (avec_map->find(estyle) != avec_map->end()) {
         AtomVecCreator avec_creator = (*avec_map)[estyle];
         return avec_creator(lmp);
diff --git a/src/domain.cpp b/src/domain.cpp
index 2e7652a434..74d7560c31 100644
--- a/src/domain.cpp
+++ b/src/domain.cpp
@@ -1734,7 +1734,7 @@ void Domain::add_region(int narg, char **arg)
   if (lmp->suffix_enable) {
     if (lmp->suffix) {
       char estyle[256];
-      sprintf(estyle,"%s/%s",arg[1],lmp->suffix);
+      snprintf(estyle,256,"%s/%s",arg[1],lmp->suffix);
       if (region_map->find(estyle) != region_map->end()) {
         RegionCreator region_creator = (*region_map)[estyle];
         regions[nregion] = region_creator(lmp, narg, arg);
@@ -1746,7 +1746,7 @@ void Domain::add_region(int narg, char **arg)
 
     if (lmp->suffix2) {
       char estyle[256];
-      sprintf(estyle,"%s/%s",arg[1],lmp->suffix2);
+      snprintf(estyle,256,"%s/%s",arg[1],lmp->suffix2);
       if (region_map->find(estyle) != region_map->end()) {
         RegionCreator region_creator = (*region_map)[estyle];
         regions[nregion] = region_creator(lmp, narg, arg);
diff --git a/src/force.cpp b/src/force.cpp
index ed27df1215..2648358932 100644
--- a/src/force.cpp
+++ b/src/force.cpp
@@ -238,7 +238,7 @@ Pair *Force::new_pair(const char *style, int trysuffix, int &sflag)
     if (lmp->suffix) {
       sflag = 1;
       char estyle[256];
-      sprintf(estyle,"%s/%s",style,lmp->suffix);
+      snprintf(estyle,256,"%s/%s",style,lmp->suffix);
       if (pair_map->find(estyle) != pair_map->end()) {
         PairCreator pair_creator = (*pair_map)[estyle];
         return pair_creator(lmp);
@@ -247,7 +247,7 @@ Pair *Force::new_pair(const char *style, int trysuffix, int &sflag)
     if (lmp->suffix2) {
       sflag = 2;
       char estyle[256];
-      sprintf(estyle,"%s/%s",style,lmp->suffix2);
+      snprintf(estyle,256,"%s/%s",style,lmp->suffix2);
       if (pair_map->find(estyle) != pair_map->end()) {
         PairCreator pair_creator = (*pair_map)[estyle];
         return pair_creator(lmp);
@@ -350,7 +350,7 @@ Bond *Force::new_bond(const char *style, int trysuffix, int &sflag)
     if (lmp->suffix) {
       sflag = 1;
       char estyle[256];
-      sprintf(estyle,"%s/%s",style,lmp->suffix);
+      snprintf(estyle,256,"%s/%s",style,lmp->suffix);
       if (bond_map->find(estyle) != bond_map->end()) {
         BondCreator bond_creator = (*bond_map)[estyle];
         return bond_creator(lmp);
@@ -360,7 +360,7 @@ Bond *Force::new_bond(const char *style, int trysuffix, int &sflag)
     if (lmp->suffix2) {
       sflag = 2;
       char estyle[256];
-      sprintf(estyle,"%s/%s",style,lmp->suffix2);
+      snprintf(estyle,256,"%s/%s",style,lmp->suffix2);
       if (bond_map->find(estyle) != bond_map->end()) {
         BondCreator bond_creator = (*bond_map)[estyle];
         return bond_creator(lmp);
@@ -429,7 +429,7 @@ Angle *Force::new_angle(const char *style, int trysuffix, int &sflag)
     if (lmp->suffix) {
       sflag = 1;
       char estyle[256];
-      sprintf(estyle,"%s/%s",style,lmp->suffix);
+      snprintf(estyle,256,"%s/%s",style,lmp->suffix);
       if (angle_map->find(estyle) != angle_map->end()) {
         AngleCreator angle_creator = (*angle_map)[estyle];
         return angle_creator(lmp);
@@ -439,7 +439,7 @@ Angle *Force::new_angle(const char *style, int trysuffix, int &sflag)
     if (lmp->suffix2) {
       sflag = 2;
       char estyle[256];
-      sprintf(estyle,"%s/%s",style,lmp->suffix);
+      snprintf(estyle,256,"%s/%s",style,lmp->suffix);
       if (angle_map->find(estyle) != angle_map->end()) {
         AngleCreator angle_creator = (*angle_map)[estyle];
         return angle_creator(lmp);
@@ -509,7 +509,7 @@ Dihedral *Force::new_dihedral(const char *style, int trysuffix, int &sflag)
     if (lmp->suffix) {
       sflag = 1;
       char estyle[256];
-      sprintf(estyle,"%s/%s",style,lmp->suffix);
+      snprintf(estyle,256,"%s/%s",style,lmp->suffix);
       if (dihedral_map->find(estyle) != dihedral_map->end()) {
         DihedralCreator dihedral_creator = (*dihedral_map)[estyle];
         return dihedral_creator(lmp);
@@ -519,7 +519,7 @@ Dihedral *Force::new_dihedral(const char *style, int trysuffix, int &sflag)
     if (lmp->suffix2) {
       sflag = 2;
       char estyle[256];
-      sprintf(estyle,"%s/%s",style,lmp->suffix2);
+      snprintf(estyle,256,"%s/%s",style,lmp->suffix2);
       if (dihedral_map->find(estyle) != dihedral_map->end()) {
         DihedralCreator dihedral_creator = (*dihedral_map)[estyle];
         return dihedral_creator(lmp);
@@ -588,7 +588,7 @@ Improper *Force::new_improper(const char *style, int trysuffix, int &sflag)
     if (lmp->suffix) {
       sflag = 1;
       char estyle[256];
-      sprintf(estyle,"%s/%s",style,lmp->suffix);
+      snprintf(estyle,256,"%s/%s",style,lmp->suffix);
       if (improper_map->find(estyle) != improper_map->end()) {
         ImproperCreator improper_creator = (*improper_map)[estyle];
         return improper_creator(lmp);
@@ -598,7 +598,7 @@ Improper *Force::new_improper(const char *style, int trysuffix, int &sflag)
     if (lmp->suffix2) {
       sflag = 2;
       char estyle[256];
-      sprintf(estyle,"%s/%s",style,lmp->suffix2);
+      snprintf(estyle,256,"%s/%s",style,lmp->suffix2);
       if (improper_map->find(estyle) != improper_map->end()) {
         ImproperCreator improper_creator = (*improper_map)[estyle];
         return improper_creator(lmp);
@@ -671,7 +671,7 @@ KSpace *Force::new_kspace(const char *style, int trysuffix, int &sflag)
     if (lmp->suffix) {
       sflag = 1;
       char estyle[256];
-      sprintf(estyle,"%s/%s",style,lmp->suffix);
+      snprintf(estyle,256,"%s/%s",style,lmp->suffix);
       if (kspace_map->find(estyle) != kspace_map->end()) {
         KSpaceCreator kspace_creator = (*kspace_map)[estyle];
         return kspace_creator(lmp);
@@ -681,7 +681,7 @@ KSpace *Force::new_kspace(const char *style, int trysuffix, int &sflag)
     if (lmp->suffix2) {
       sflag = 1;
       char estyle[256];
-      sprintf(estyle,"%s/%s",style,lmp->suffix2);
+      snprintf(estyle,256,"%s/%s",style,lmp->suffix2);
       if (kspace_map->find(estyle) != kspace_map->end()) {
         KSpaceCreator kspace_creator = (*kspace_map)[estyle];
         return kspace_creator(lmp);
@@ -735,8 +735,8 @@ void Force::store_style(char *&str, const char *style, int sflag)
 {
   if (sflag) {
     char estyle[256];
-    if (sflag == 1) sprintf(estyle,"%s/%s",style,lmp->suffix);
-    else sprintf(estyle,"%s/%s",style,lmp->suffix2);
+    if (sflag == 1) snprintf(estyle,256,"%s/%s",style,lmp->suffix);
+    else snprintf(estyle,256,"%s/%s",style,lmp->suffix2);
     int n = strlen(estyle) + 1;
     str = new char[n];
     strcpy(str,estyle);
diff --git a/src/input.cpp b/src/input.cpp
index 0111cb5738..9e0ad78d9e 100644
--- a/src/input.cpp
+++ b/src/input.cpp
@@ -1818,11 +1818,11 @@ void Input::pair_style()
     if (!match && lmp->suffix_enable) {
       char estyle[256];
       if (lmp->suffix) {
-        sprintf(estyle,"%s/%s",arg[0],lmp->suffix);
+        snprintf(estyle,256,"%s/%s",arg[0],lmp->suffix);
         if (strcmp(estyle,force->pair_style) == 0) match = 1;
       }
       if (lmp->suffix2) {
-        sprintf(estyle,"%s/%s",arg[0],lmp->suffix2);
+        snprintf(estyle,256,"%s/%s",arg[0],lmp->suffix2);
         if (strcmp(estyle,force->pair_style) == 0) match = 1;
       }
     }
diff --git a/src/update.cpp b/src/update.cpp
index 6f9c2c9a07..f5e706e354 100644
--- a/src/update.cpp
+++ b/src/update.cpp
@@ -316,8 +316,8 @@ void Update::create_integrate(int narg, char **arg, int trysuffix)
 
   if (sflag) {
     char estyle[256];
-    if (sflag == 1) sprintf(estyle,"%s/%s",arg[0],lmp->suffix);
-    else sprintf(estyle,"%s/%s",arg[0],lmp->suffix2);
+    if (sflag == 1) snprintf(estyle,256,"%s/%s",arg[0],lmp->suffix);
+    else snprintf(estyle,256,"%s/%s",arg[0],lmp->suffix2);
     int n = strlen(estyle) + 1;
     integrate_style = new char[n];
     strcpy(integrate_style,estyle);
@@ -339,7 +339,7 @@ void Update::new_integrate(char *style, int narg, char **arg,
     if (lmp->suffix) {
       sflag = 1;
       char estyle[256];
-      sprintf(estyle,"%s/%s",style,lmp->suffix);
+      snprintf(estyle,256,"%s/%s",style,lmp->suffix);
       if (integrate_map->find(estyle) != integrate_map->end()) {
         IntegrateCreator integrate_creator = (*integrate_map)[estyle];
         integrate = integrate_creator(lmp, narg, arg);
@@ -350,7 +350,7 @@ void Update::new_integrate(char *style, int narg, char **arg,
     if (lmp->suffix2) {
       sflag = 2;
       char estyle[256];
-      sprintf(estyle,"%s/%s",style,lmp->suffix2);
+      snprintf(estyle,256,"%s/%s",style,lmp->suffix2);
       if (integrate_map->find(estyle) != integrate_map->end()) {
         IntegrateCreator integrate_creator = (*integrate_map)[estyle];
         integrate = integrate_creator(lmp, narg, arg);