diff --git a/glm/gtc/quaternion.hpp b/glm/gtc/quaternion.hpp
index 0735abf8..812b5b00 100644
--- a/glm/gtc/quaternion.hpp
+++ b/glm/gtc/quaternion.hpp
@@ -59,7 +59,7 @@ namespace glm
 	/// @addtogroup gtc_quaternion
 	/// @{
 
-	template <typename T, precision P>
+	template <typename T, precision P = defaultp>
 	struct tquat
 	{
 		typedef tquat<T, P> type;