diff --git a/singleton.hpp b/singleton.hpp
index 099651b2..67d57835 100644
--- a/singleton.hpp
+++ b/singleton.hpp
@@ -28,7 +28,7 @@ namespace cruft {
 
     public:
         static bool
-        valid (void) noexcept
+        is_valid (void) noexcept
         {
             return instance;
         }