diff --git a/include/half.hpp b/include/half.hpp
index cb658f2..5c054c6 100644
--- a/include/half.hpp
+++ b/include/half.hpp
@@ -442,7 +442,7 @@ namespace half_float
 	/// ~~~~
 	namespace literal
 	{
-		half operator "" _h(long double);
+		half operator ""_h(long double);
 	}
 #endif
 
@@ -2261,7 +2261,7 @@ namespace half_float
 		friend struct std::hash<half>;
 	#endif
 	#if HALF_ENABLE_CPP11_USER_LITERALS
-		friend half literal::operator "" _h(long double);
+		friend half literal::operator ""_h(long double);
 	#endif
 	#endif
 	};
@@ -2276,7 +2276,7 @@ namespace half_float
 		/// \param value literal value
 		/// \return half with of given value (possibly rounded)
 		/// \exception FE_OVERFLOW, ...UNDERFLOW, ...INEXACT according to rounding
-		inline half operator "" _h(long double value) { return half(detail::binary, detail::float2half<half::round_style>(value)); }
+		inline half operator ""_h(long double value) { return half(detail::binary, detail::float2half<half::round_style>(value)); }
 	}
 #endif