diff --git a/hash/test/container_fwd_test.cpp b/hash/test/container_fwd_test.cpp
index e51df8c..7baaa67 100644
--- a/hash/test/container_fwd_test.cpp
+++ b/hash/test/container_fwd_test.cpp
@@ -91,4 +91,6 @@ int main()
     test(x9);
     test(x10);
     test(x11);
+
+    return 0;
 }