diff --git a/tests/Common/TestApps/pixelchanged/main.c b/tests/Common/TestApps/pixelchanged/main.c
index 28a3c14..d22bc2d 100644
--- a/tests/Common/TestApps/pixelchanged/main.c
+++ b/tests/Common/TestApps/pixelchanged/main.c
@@ -214,6 +214,7 @@ int main(int argc, char **argv)
             quit_when_found = 1;
         } else {
             fprintf(stderr, "Unrecognized option %s\n", argv[arg]);
+            return EXIT_FAILURE;
         }
         ++arg;
     }