diff --git a/glm/core/_swizzle.hpp b/glm/core/_swizzle.hpp
index 33815ff8..5da02a89 100644
--- a/glm/core/_swizzle.hpp
+++ b/glm/core/_swizzle.hpp
@@ -29,8 +29,6 @@
 #ifndef glm_core_swizzle
 #define glm_core_swizzle
 
-#include "_swizzle_func.hpp"
-
 namespace glm
 {
 	enum comp
diff --git a/glm/core/type_vec1.hpp b/glm/core/type_vec1.hpp
index 7ab9b88a..1f56c0e0 100644
--- a/glm/core/type_vec1.hpp
+++ b/glm/core/type_vec1.hpp
@@ -31,7 +31,13 @@
 
 #include "../fwd.hpp"
 #include "type_vec.hpp"
-#include "_swizzle.hpp"
+#ifdef GLM_SWIZZLE
+#	if GLM_HAS_ANONYMOUS_UNION
+#		include "_swizzle.hpp"
+#	else
+#		include "_swizzle_func.hpp"
+#	endif
+#endif //GLM_SWIZZLE
 
 namespace glm{
 namespace detail
diff --git a/glm/core/type_vec2.hpp b/glm/core/type_vec2.hpp
index 6e8e0d3b..fa377698 100644
--- a/glm/core/type_vec2.hpp
+++ b/glm/core/type_vec2.hpp
@@ -31,7 +31,13 @@
 
 #include "../fwd.hpp"
 #include "type_vec.hpp"
-#include "_swizzle.hpp"
+#ifdef GLM_SWIZZLE
+#	if GLM_HAS_ANONYMOUS_UNION
+#		include "_swizzle.hpp"
+#	else
+#		include "_swizzle_func.hpp"
+#	endif
+#endif //GLM_SWIZZLE
 
 namespace glm{
 namespace detail
diff --git a/glm/core/type_vec3.hpp b/glm/core/type_vec3.hpp
index 68603ae6..424ffdce 100644
--- a/glm/core/type_vec3.hpp
+++ b/glm/core/type_vec3.hpp
@@ -31,7 +31,13 @@
 
 #include "../fwd.hpp"
 #include "type_vec.hpp"
-#include "_swizzle.hpp"
+#ifdef GLM_SWIZZLE
+#	if GLM_HAS_ANONYMOUS_UNION
+#		include "_swizzle.hpp"
+#	else
+#		include "_swizzle_func.hpp"
+#	endif
+#endif //GLM_SWIZZLE
 
 namespace glm{
 namespace detail
diff --git a/glm/core/type_vec4.hpp b/glm/core/type_vec4.hpp
index 3325c967..a1438d02 100644
--- a/glm/core/type_vec4.hpp
+++ b/glm/core/type_vec4.hpp
@@ -31,7 +31,13 @@
 
 #include "../fwd.hpp"
 #include "type_vec.hpp"
-#include "_swizzle.hpp"
+#ifdef GLM_SWIZZLE
+#	if GLM_HAS_ANONYMOUS_UNION
+#		include "_swizzle.hpp"
+#	else
+#		include "_swizzle_func.hpp"
+#	endif
+#endif //GLM_SWIZZLE
 
 namespace glm{
 namespace detail