diff --git a/glm/gtx/dual_quaternion.inl b/glm/gtx/dual_quaternion.inl
index f5c1da08..5c82b882 100644
--- a/glm/gtx/dual_quaternion.inl
+++ b/glm/gtx/dual_quaternion.inl
@@ -28,8 +28,8 @@ namespace glm
 		template<typename T, qualifier Q>
 		GLM_FUNC_QUALIFIER GLM_CONSTEXPR tdualquat<T, Q>::tdualquat()
 #			ifdef GLM_FORCE_CTOR_INIT
-			: real(tquat<T, P>())
-			, dual(tquat<T, P>(0, 0, 0, 0))
+			: real(tquat<T, Q>())
+			, dual(tquat<T, Q>(0, 0, 0, 0))
 #			endif
 		{}
 #	endif
diff --git a/test/gtx/gtx_dual_quaternion.cpp b/test/gtx/gtx_dual_quaternion.cpp
index 1e868744..ceedc2c2 100644
--- a/test/gtx/gtx_dual_quaternion.cpp
+++ b/test/gtx/gtx_dual_quaternion.cpp
@@ -1,4 +1,5 @@
 #define GLM_ENABLE_EXPERIMENTAL
+#define GLM_FORCE_CTOR_INIT
 #include <glm/gtx/dual_quaternion.hpp>
 #include <glm/gtc/matrix_transform.hpp>
 #include <glm/gtc/epsilon.hpp>