diff --git a/glm/detail/type_vec4.hpp b/glm/detail/type_vec4.hpp
index fbe8c0e5..e78f5a56 100644
--- a/glm/detail/type_vec4.hpp
+++ b/glm/detail/type_vec4.hpp
@@ -142,7 +142,7 @@ namespace glm
 		template<typename X, typename Y, typename Z, typename W>
 		GLM_FUNC_DECL GLM_CONSTEXPR vec(X _x, vec<1, Y, Q> const& _y, vec<1, Z, Q> const& _z, vec<1, W, Q> const& _w);
 		template<typename X, typename Y, typename Z, typename W>
-		GLM_FUNC_DECL GLM_CONSTEXPR vec(vec<1, X, Q> const& _x, vec<1, Y, Q> const& _Y, vec<1, Z, Q> const& _z, vec<1, W, Q> const& _w);
+		GLM_FUNC_DECL GLM_CONSTEXPR vec(vec<1, X, Q> const& _x, vec<1, Y, Q> const& _y, vec<1, Z, Q> const& _z, vec<1, W, Q> const& _w);
 
 		// -- Conversion vector constructors --