1 files changed, 4 insertions, 0 deletions
diff --git a/tool/src-verify.c b/tool/src-verify.c
index 762904656..0c7ed6f4c 100644
--- a/tool/src-verify.c
+++ b/tool/src-verify.c
@@ -854,12 +854,16 @@ int main(int argc, char **argv){
       xErr = errorMsgNH;
       continue;
     }
+  usage:
     fprintf(stderr, "Usage: %s DIRECTORY\n"
                     "   or: %s --sha1 FILE ...\n"
                     "   or: %s --sha3 FILE ...\n",
       argv[0], argv[0], argv[0]);
     return 1;
   }
+  if( !zDir ){
+    goto usage;
+  }
   if( strlen(zDir)>1000 ){
     fprintf(stderr, "Directory argument too big: [%s]\n", zDir);
     return 1;