diff --git a/tests/TestChecks.cpp b/tests/TestChecks.cpp
index 645c3d9..2c0ac04 100644
--- a/tests/TestChecks.cpp
+++ b/tests/TestChecks.cpp
@@ -323,7 +323,7 @@ namespace {
       {
       }
 
-      TruthyUnlessCopied(const TruthyUnlessCopied& orig)
+      TruthyUnlessCopied(const TruthyUnlessCopied&)
       : truthy_(false)
       {
       }