diff --git a/glm/gtx/dual_quaternion.hpp b/glm/gtx/dual_quaternion.hpp
index 3cb14746..a8005cb8 100644
--- a/glm/gtx/dual_quaternion.hpp
+++ b/glm/gtx/dual_quaternion.hpp
@@ -58,7 +58,7 @@ namespace glm
 	/// @addtogroup gtx_dual_quaternion
 	/// @{
 
-	template <typename T, precision P>
+	template <typename T, precision P = defaultp>
 	struct tdualquat
 	{
 		typedef T value_type;
diff --git a/readme.txt b/readme.txt
index 7bf7e40d..2a797b2f 100644
--- a/readme.txt
+++ b/readme.txt
@@ -81,6 +81,7 @@ Deprecation:
 GLM 0.9.6.4: 2015-0X-XX
 --------------------------------------------------------------------------------
 Fixes:
+- Fixed default precision for quat and dual_quat type #312
 
 ================================================================================
 GLM 0.9.6.3: 2015-02-15