diff --git a/test/hash/halfsipmix.cpp b/test/hash/halfsipmix.cpp
index 31a560e5..3234c4f0 100644
--- a/test/hash/halfsipmix.cpp
+++ b/test/hash/halfsipmix.cpp
@@ -84,6 +84,7 @@ int siphash_test (ValueT const *v) {
         }
     }
 
+    (void)fails;
     return any_failed;
 }