diff --git a/glm/core/_swizzle_func.hpp b/glm/core/_swizzle_func.hpp
index faa98478..b9df96a8 100644
--- a/glm/core/_swizzle_func.hpp
+++ b/glm/core/_swizzle_func.hpp
@@ -38,7 +38,7 @@
 #define GLM_SWIZZLE_GEN_VEC3_ENTRY(TMPL_TYPE, CLASS_TYPE, SWIZZLED_TYPE, CONST, A, B, C) \
 	SWIZZLED_TYPE<TMPL_TYPE> A ## B ## C() CONST \
 	{ \
-		return SWIZZLED_TYPE<TMPL_TYPE>(this->A, this->B, this->B); \
+		return SWIZZLED_TYPE<TMPL_TYPE>(this->A, this->B, this->C); \
 	}
 
 #define GLM_SWIZZLE_GEN_VEC4_ENTRY(TMPL_TYPE, CLASS_TYPE, SWIZZLED_TYPE, CONST, A, B, C, D) \
@@ -58,7 +58,7 @@
 	template <typename TMPL_TYPE> \
 	SWIZZLED_TYPE<TMPL_TYPE> CLASS_TYPE<TMPL_TYPE>::A ## B ## C() CONST \
 	{ \
-		return SWIZZLED_TYPE<TMPL_TYPE>(this->A, this->B, this->B); \
+		return SWIZZLED_TYPE<TMPL_TYPE>(this->A, this->B, this->C); \
 	}
 
 #define GLM_SWIZZLE_GEN_VEC4_ENTRY_DEF(TMPL_TYPE, CLASS_TYPE, SWIZZLED_TYPE, CONST, A, B, C, D) \
@@ -98,8 +98,8 @@
 	GLM_SWIZZLE_GEN_VEC3_ENTRY(TMPL_TYPE, CLASS_TYPE, SWIZZLED_TYPE, GLM_MUTABLE, C, B, A)
 
 #define GLM_SWIZZLE_GEN_REF_FROM_VEC3_COMP(TMPL_TYPE, CLASS_TYPE, SWIZZLED_VEC2_TYPE, SWIZZLED_VEC3_TYPE, A, B, C) \
-	GLM_SWIZZLE_GEN_REF2_FROM_VEC3_SWIZZLE(TMPL_TYPE, CLASS_TYPE, SWIZZLED_VEC2_TYPE, A, B, C) \
-	GLM_SWIZZLE_GEN_REF3_FROM_VEC3_SWIZZLE(TMPL_TYPE, CLASS_TYPE, SWIZZLED_VEC3_TYPE, A, B, C)
+	GLM_SWIZZLE_GEN_REF3_FROM_VEC3_SWIZZLE(TMPL_TYPE, CLASS_TYPE, SWIZZLED_VEC3_TYPE, A, B, C) \
+	GLM_SWIZZLE_GEN_REF2_FROM_VEC3_SWIZZLE(TMPL_TYPE, CLASS_TYPE, SWIZZLED_VEC2_TYPE, A, B, C)
 
 #define GLM_SWIZZLE_GEN_REF_FROM_VEC3(TMPL_TYPE, CLASS_TYPE, SWIZZLED_VEC2_TYPE, SWIZZLED_VEC3_TYPE) \
 	GLM_SWIZZLE_GEN_REF_FROM_VEC3_COMP(TMPL_TYPE, CLASS_TYPE, SWIZZLED_VEC2_TYPE, SWIZZLED_VEC3_TYPE, x, y, z) \
diff --git a/glm/core/type_vec2.hpp b/glm/core/type_vec2.hpp
index 0bd8e990..701138fb 100644
--- a/glm/core/type_vec2.hpp
+++ b/glm/core/type_vec2.hpp
@@ -229,7 +229,7 @@ namespace detail
 	{
 		GLM_FUNC_DECL tref2(T & x, T & y);
 		GLM_FUNC_DECL tref2(tref2<T> const & r);
-		GLM_FUNC_DECL tref2(tvec2<T> const & v);
+		GLM_FUNC_DECL explicit tref2(tvec2<T> const & v);
 
 		GLM_FUNC_DECL tref2<T> & operator= (tref2<T> const & r);
 		GLM_FUNC_DECL tref2<T> & operator= (tvec2<T> const & v);
diff --git a/glm/core/type_vec3.hpp b/glm/core/type_vec3.hpp
index ea4c49e9..4b19b706 100644
--- a/glm/core/type_vec3.hpp
+++ b/glm/core/type_vec3.hpp
@@ -254,7 +254,7 @@ namespace detail
 	{
 		GLM_FUNC_DECL tref3(T & x, T & y, T & z);
 		GLM_FUNC_DECL tref3(tref3<T> const & r);
-		GLM_FUNC_DECL tref3(tvec3<T> const & v);
+		GLM_FUNC_DECL explicit tref3(tvec3<T> const & v);
 
 		GLM_FUNC_DECL tref3<T> & operator= (tref3<T> const & r);
 		GLM_FUNC_DECL tref3<T> & operator= (tvec3<T> const & v);
diff --git a/glm/core/type_vec4.hpp b/glm/core/type_vec4.hpp
index 440af9ea..78d20097 100644
--- a/glm/core/type_vec4.hpp
+++ b/glm/core/type_vec4.hpp
@@ -310,7 +310,7 @@ namespace detail
 	{
 		GLM_FUNC_DECL tref4(T & x, T & y, T & z, T & w);
 		GLM_FUNC_DECL tref4(tref4<T> const & r);
-		GLM_FUNC_DECL tref4(tvec4<T> const & v);
+		GLM_FUNC_DECL explicit tref4(tvec4<T> const & v);
 
 		GLM_FUNC_DECL tref4<T> & operator= (tref4<T> const & r);
 		GLM_FUNC_DECL tref4<T> & operator= (tvec4<T> const & v);
diff --git a/test/core/core_func_swizzle.cpp b/test/core/core_func_swizzle.cpp
index 5b57a379..b56b707c 100644
--- a/test/core/core_func_swizzle.cpp
+++ b/test/core/core_func_swizzle.cpp
@@ -7,7 +7,7 @@
 // File    : test/core/core_func_swizzle.cpp
 ///////////////////////////////////////////////////////////////////////////////////////////////////
 
-//#define GLM_FORCE_ONLY_XYZW
+#define GLM_FORCE_ONLY_XYZW
 //#define GLM_FORCE_PURE
 #define GLM_MESSAGES
 #define GLM_SWIZZLE