diff --git a/src/fix_addforce.cpp b/src/fix_addforce.cpp
index 07031a40a4..a9f6248995 100644
--- a/src/fix_addforce.cpp
+++ b/src/fix_addforce.cpp
@@ -193,7 +193,7 @@ void FixAddForce::init()
       update->whichflag == 2 && estyle == NONE)
     error->all(FLERR,"Must use variable energy with fix addforce");
 
-  if (strstr(update->integrate_style,"respa")) {
+  if (utils::strmatch(update->integrate_style,"^respa")) {
     ilevel_respa = ((Respa *) update->integrate)->nlevels-1;
     if (respa_level >= 0) ilevel_respa = MIN(respa_level,ilevel_respa);
   }
@@ -203,7 +203,7 @@ void FixAddForce::init()
 
 void FixAddForce::setup(int vflag)
 {
-  if (strstr(update->integrate_style,"verlet"))
+  if (utils::strmatch(update->integrate_style,"^verlet"))
     post_force(vflag);
   else {
     ((Respa *) update->integrate)->copy_flevel_f(ilevel_respa);
diff --git a/src/fix_recenter.cpp b/src/fix_recenter.cpp
index 1db74981b6..f5e4513d74 100644
--- a/src/fix_recenter.cpp
+++ b/src/fix_recenter.cpp
@@ -144,7 +144,7 @@ void FixRecenter::init()
     zinit = xcm[2];
   }
 
-  if (strstr(update->integrate_style,"respa"))
+  if (utils::strmatch(update->integrate_style,"^respa"))
     nlevels_respa = ((Respa *) update->integrate)->nlevels;
 }