diff --git a/extras/webp_quality.c b/extras/webp_quality.c
index 69fc8223..9ab38f03 100644
--- a/extras/webp_quality.c
+++ b/extras/webp_quality.c
@@ -18,23 +18,25 @@
 int main(int argc, const char *argv[]) {
   int c;
   int quiet = 0;
-  for (c = 1; c < argc; ++c) {
+  int ok = 1;
+  for (c = 1; ok && c < argc; ++c) {
     if (!strcmp(argv[c], "-quiet")) {
       quiet = 1;
     } else if (!strcmp(argv[c], "-help") || !strcmp(argv[c], "-h")) {
       printf("webp_quality [-h][-quiet] webp_files...\n");
-      return 1;
+      return 0;
     } else {
       const char* const filename = argv[c];
       const uint8_t* data = NULL;
       size_t data_size = 0;
       int q;
-      const int ok = ImgIoUtilReadFile(filename, &data, &data_size);
-      if (!ok) continue;
+      ok = ImgIoUtilReadFile(filename, &data, &data_size);
+      if (!ok) break;
       q = VP8EstimateQuality(data, data_size);
       if (!quiet) printf("[%s] ", filename);
       if (q < 0) {
         fprintf(stderr, "Not a WebP file, or not a lossy WebP file.\n");
+        ok = 0;
       } else {
         if (!quiet) {
           printf("Estimated quality factor: %d\n", q);
@@ -45,5 +47,5 @@ int main(int argc, const char *argv[]) {
       free((void*)data);
     }
   }
-  return 1;
+  return ok ? 0 : 1;
 }