diff --git a/glm/gtx/matrix_factorisation.inl b/glm/gtx/matrix_factorisation.inl
index 32215b47..f0d9560c 100644
--- a/glm/gtx/matrix_factorisation.inl
+++ b/glm/gtx/matrix_factorisation.inl
@@ -6,7 +6,7 @@ namespace glm
 	template <length_t C, length_t R, typename T, qualifier Q>
 	GLM_FUNC_QUALIFIER mat<C, R, T, Q> flipud(mat<C, R, T, Q> const& in)
 	{
-		mat<R, C, T, P> tin = transpose(in);
+		mat<R, C, T, Q> tin = transpose(in);
 		tin = fliplr(tin);
 		mat<C, R, T, Q> out = transpose(tin);