diff --git a/strongdef.hpp b/strongdef.hpp
index 6217344f..b642de87 100644
--- a/strongdef.hpp
+++ b/strongdef.hpp
@@ -64,7 +64,7 @@ namespace util {
         // allowing equality with different types or tags.
         template <typename U, typename TagU>
         std::enable_if_t<
-            !std::is_same<T,U>::value ||
+            !std::is_same<T,  U   >::value ||
             !std::is_same<Tag,TagU>::value,
             bool
         >
@@ -74,7 +74,7 @@ namespace util {
         template <typename U, typename TagU>
         constexpr
         std::enable_if_t<
-            std::is_same<T,U>::value &&
+            std::is_same<T,  U   >::value &&
             std::is_same<Tag,TagU>::value,
             bool
         >