diff --git a/test/aligned_storage_test.cpp b/test/aligned_storage_test.cpp
index f1cd89f..e15cf9f 100644
--- a/test/aligned_storage_test.cpp
+++ b/test/aligned_storage_test.cpp
@@ -23,7 +23,7 @@ union must_be_pod
 };
 
 template <class T>
-void no_unused_warning(const volatile T&)
+inline void no_unused_warning(const volatile T&)
 {
 }