diff --git a/code/nel/src/3d/driver/opengl/driver_opengl_extension.cpp b/code/nel/src/3d/driver/opengl/driver_opengl_extension.cpp
index 6b9edacf3..f13d33c7b 100644
--- a/code/nel/src/3d/driver/opengl/driver_opengl_extension.cpp
+++ b/code/nel/src/3d/driver/opengl/driver_opengl_extension.cpp
@@ -445,7 +445,7 @@ PFNWGLGETEXTENSIONSSTRINGARBPROC				nwglGetExtensionsStringARB;
 #elif defined(NL_OS_UNIX)
 
 // Swap control extensions
-PFNGLXSWAPINTERVALEXTPROC						nglXSwapIntervalEXT;
+NEL_PFNGLXSWAPINTERVALEXTPROC					nglXSwapIntervalEXT;
 
 PFNGLXSWAPINTERVALSGIPROC						nglXSwapIntervalSGI;
 
@@ -1429,7 +1429,7 @@ static bool	setupGLXEXTSwapControl(const char	*glext)
 	CHECK_EXT("GLX_EXT_swap_control");
 
 #if defined(NL_OS_UNIX) && !defined(NL_OS_MAC)
-	CHECK_ADDRESS(PFNGLXSWAPINTERVALEXTPROC, glXSwapIntervalEXT);
+	CHECK_ADDRESS(NEL_PFNGLXSWAPINTERVALEXTPROC, glXSwapIntervalEXT);
 #endif
 
 	return true;
diff --git a/code/nel/src/3d/driver/opengl/driver_opengl_extension.h b/code/nel/src/3d/driver/opengl/driver_opengl_extension.h
index 43fb3bc08..a899049b6 100644
--- a/code/nel/src/3d/driver/opengl/driver_opengl_extension.h
+++ b/code/nel/src/3d/driver/opengl/driver_opengl_extension.h
@@ -698,7 +698,7 @@ extern PFNWGLGETEXTENSIONSSTRINGARBPROC			nwglGetExtensionsStringARB;
 
 // Swap control extensions
 //===========================
-extern PFNGLXSWAPINTERVALEXTPROC				nglXSwapIntervalEXT;
+extern NEL_PFNGLXSWAPINTERVALEXTPROC			nglXSwapIntervalEXT;
 
 extern PFNGLXSWAPINTERVALSGIPROC				nglXSwapIntervalSGI;
 
diff --git a/code/nel/src/3d/driver/opengl/driver_opengl_extension_def.h b/code/nel/src/3d/driver/opengl/driver_opengl_extension_def.h
index e5ab60c8c..3347f7177 100644
--- a/code/nel/src/3d/driver/opengl/driver_opengl_extension_def.h
+++ b/code/nel/src/3d/driver/opengl/driver_opengl_extension_def.h
@@ -376,6 +376,27 @@ typedef GLvoid    (APIENTRY * NEL_PFNGLGETOCCLUSIONQUERYUIVNVPROC) (GLuint id, G
 typedef GLvoid    (APIENTRY * NEL_PFNGLSAMPLECOVERAGEARBPROC) (GLclampf value, GLboolean invert);
 #endif
 
+#if defined(NL_OS_MAC)
+
+// Mac GL extensions
+
+#elif defined(NL_OS_UNIX)
+
+// GLX extensions
+#ifndef NL_GLX_EXT_swap_control
+#define NL_GLX_EXT_swap_control 1
+
+#ifndef GLX_EXT_swap_control
+#define GLX_SWAP_INTERVAL_EXT              0x20F1
+#define GLX_MAX_SWAP_INTERVAL_EXT          0x20F2
+#endif
+
+typedef GLint (APIENTRY * NEL_PFNGLXSWAPINTERVALEXTPROC) (Display *dpy, GLXDrawable drawable, GLint interval);
+
+#endif // NL_GLX_EXT_swap_control
+
+#endif // NL_OS_MAC
+
 #ifdef __cplusplus
 }
 #endif