diff --git a/lib/md5_test.C b/lib/md5_test.C
index 45277ee62f..0a26deeeda 100644
--- a/lib/md5_test.C
+++ b/lib/md5_test.C
@@ -2,10 +2,12 @@
 
 #include "md5_file.h"
 
-main(int, char** argv) {
+int main(int, char** argv) {
     char out[33];
     double nbytes;
 
     md5_file(argv[1], out, nbytes);
     printf("%s\n%f bytes\n", out, nbytes);
+
+    return 0;
 }
diff --git a/lib/shmem_test.C b/lib/shmem_test.C
index 1ee54e794f..7e43a8f134 100644
--- a/lib/shmem_test.C
+++ b/lib/shmem_test.C
@@ -13,7 +13,7 @@
 
 #include "shmem.h"
 
-main(int argc, char** argv) {
+int main(int argc, char** argv) {
     void* p;
     int retval;
 
@@ -25,4 +25,6 @@ main(int argc, char** argv) {
     } else if (!strcmp(argv[1], "-c")) {
         create_shmem(KEY, 100, &p);
     }
+
+    return 0;
 }