diff --git a/src/fix_store.cpp b/src/fix_store.cpp
index b693aa94d8..85371d9e34 100644
--- a/src/fix_store.cpp
+++ b/src/fix_store.cpp
@@ -301,7 +301,7 @@ void FixStore::unpack_restart(int nlocal, int nth)
   // skip to Nth set of extra values
 
   int m = 0;
-  for (int i = 0; i < nth; i++) m += static_cast<int> extra[nlocal][m];
+  for (int i = 0; i < nth; i++) m += static_cast<int> (extra[nlocal][m]);
   m++;
 
   if (vecflag) vstore[nlocal] = extra[nlocal][m];