diff --git a/sol/types.hpp b/sol/types.hpp
index c1cf4b4e..e84682e0 100644
--- a/sol/types.hpp
+++ b/sol/types.hpp
@@ -115,6 +115,7 @@ inline type type_of<bool>() {
 }
 
 inline bool operator==(nil_t, nil_t) { return true; }
+inline bool operator!=(nil_t, nil_t) { return false; }
 } // sol
 
 #endif // SOL_TYPES_HPP
\ No newline at end of file