diff --git a/src/MANYBODY/pair_vashishta_table.cpp b/src/MANYBODY/pair_vashishta_table.cpp
index 475710a396..76b44d8664 100644
--- a/src/MANYBODY/pair_vashishta_table.cpp
+++ b/src/MANYBODY/pair_vashishta_table.cpp
@@ -289,6 +289,5 @@ void PairVashishtaTable::create_tables()
 
 double PairVashishtaTable::memory_usage()
 {
-  double bytes = 2*nelements*nelements*sizeof(double)*ntable;
-  return bytes;
+  return (double)2*nelements*nelements*sizeof(double)*ntable;
 }
diff --git a/src/RIGID/fix_rigid.cpp b/src/RIGID/fix_rigid.cpp
index 8a8456393c..53b1f4c897 100644
--- a/src/RIGID/fix_rigid.cpp
+++ b/src/RIGID/fix_rigid.cpp
@@ -2452,8 +2452,8 @@ double FixRigid::memory_usage()
   bytes += (double)maxvatom*6 * sizeof(double);    // vatom
   if (extended) {
     bytes += (double)nmax * sizeof(int);
-    if (orientflag) bytes = nmax*orientflag * sizeof(double);
-    if (dorientflag) bytes = nmax*3 * sizeof(double);
+    if (orientflag) bytes = (double)nmax*orientflag * sizeof(double);
+    if (dorientflag) bytes = (double)nmax*3 * sizeof(double);
   }
   return bytes;
 }
diff --git a/src/RIGID/fix_rigid_small.cpp b/src/RIGID/fix_rigid_small.cpp
index 8129526d9c..a33703efa4 100644
--- a/src/RIGID/fix_rigid_small.cpp
+++ b/src/RIGID/fix_rigid_small.cpp
@@ -3564,8 +3564,8 @@ double FixRigidSmall::memory_usage()
   bytes += (double)maxvatom*6 * sizeof(double);     // vatom
   if (extended) {
     bytes += (double)nmax * sizeof(int);
-    if (orientflag) bytes = nmax*orientflag * sizeof(double);
-    if (dorientflag) bytes = nmax*3 * sizeof(double);
+    if (orientflag) bytes = (double)nmax*orientflag * sizeof(double);
+    if (dorientflag) bytes = (double)nmax*3 * sizeof(double);
   }
   bytes += (double)nmax_body * sizeof(Body);
   return bytes;
diff --git a/src/USER-MISC/fix_ave_correlate_long.cpp b/src/USER-MISC/fix_ave_correlate_long.cpp
index 2aafe9bac0..deeec0f1c7 100644
--- a/src/USER-MISC/fix_ave_correlate_long.cpp
+++ b/src/USER-MISC/fix_ave_correlate_long.cpp
@@ -702,8 +702,8 @@ double FixAveCorrelateLong::memory_usage() {
   //    f:              npair x numcorrelators x p
   double bytes = (4*npair*numcorrelators*p + 2*npair*numcorrelators
                   + numcorrelators*p)*sizeof(double)
-    + numcorrelators*p*sizeof(unsigned long int)
-    + 2*numcorrelators*sizeof(unsigned int);
+    + (double)numcorrelators*p*sizeof(unsigned long int)
+    + 2.0*numcorrelators*sizeof(unsigned int);
   return bytes;
 }
 
diff --git a/src/USER-MISC/fix_pimd.cpp b/src/USER-MISC/fix_pimd.cpp
index 5571f1cf35..097eb0b28f 100644
--- a/src/USER-MISC/fix_pimd.cpp
+++ b/src/USER-MISC/fix_pimd.cpp
@@ -726,9 +726,7 @@ void FixPIMD::unpack_forward_comm(int n, int first, double *buf)
 
 double FixPIMD::memory_usage()
 {
-  double bytes = 0;
-  bytes = atom->nmax * size_peratom_cols * sizeof(double);
-  return bytes;
+  return (double)atom->nmax * size_peratom_cols * sizeof(double);
 }
 
 /* ---------------------------------------------------------------------- */