diff --git a/lulesh-util.cc b/lulesh-util.cc
index 95e6231..6ebd924 100644
--- a/lulesh-util.cc
+++ b/lulesh-util.cc
@@ -163,7 +163,7 @@ void ParseCommandLineOptions(int argc, char *argv[],
          else {
             char msg[80];
             PrintCommandLineOptions(argv[0], myRank);
-            sprintf(msg, "ERROR: Unknown command line argument: %s\n", argv[i]);
+            snprintf(msg, 80, "ERROR: Unknown command line argument: %s\n", argv[i]);
             ParseError(msg, myRank);
          }
       }
diff --git a/lulesh-viz.cc b/lulesh-viz.cc
index 0504638..4197187 100644
--- a/lulesh-viz.cc
+++ b/lulesh-viz.cc
@@ -59,8 +59,8 @@ void DumpToVisit(Domain& domain, int numFiles, int myRank, int numRanks)
   DBfile *db;
 
 
-  sprintf(basename, "lulesh_plot_c%d", domain.cycle());
-  sprintf(subdirName, "data_%d", myRank);
+  snprintf(basename, 32, "lulesh_plot_c%d", domain.cycle());
+  snprintf(subdirName, 32, "data_%d", myRank);
 
 #if USE_MPI
 
@@ -80,7 +80,7 @@ void DumpToVisit(Domain& domain, int numFiles, int myRank, int numRanks)
   if (myiorank == 0) 
     strcpy(fileName, basename);
   else
-    sprintf(fileName, "%s.%03d", basename, myiorank);
+    snprintf(fileName, 64, "%s.%03d", basename, myiorank);
 
   db = (DBfile*)PMPIO_WaitForBaton(bat, fileName, subdirName);