diff --git a/src/os_vms_mms.c b/src/os_vms_mms.c
index d653860..4da7b1a 100644
--- a/src/os_vms_mms.c
+++ b/src/os_vms_mms.c
@@ -40,7 +40,8 @@
 	    strcat(target, argp);
 	}
     }
-    sprintf(cmd, "%s/output=tmp:errors.vim_tmp %s", mms, target);
+    vim_snprintf(cmd, sizeof(cmd), "%s/output=tmp:errors.vim_tmp %s",
+								 mms, target);
     system(cmd);
     fpi = fopen("tmp:errors.vim_tmp", "r");
     fpo = fopen(error_file, "w");