diff --git a/src/video/x11/SDL_x11gl.c b/src/video/x11/SDL_x11gl.c
index 1d767e17f..7e89d1707 100644
--- a/src/video/x11/SDL_x11gl.c
+++ b/src/video/x11/SDL_x11gl.c
@@ -269,7 +269,7 @@ int X11_GL_CreateContext(_THIS)
 	}
 	gl_active = 1;
 
-	if ( !glXExtensionSupported(this, "SGI_swap_control") ) {
+	if ( !glXExtensionSupported(this, "GLX_SGI_swap_control") ) {
 		this->gl_data->glXSwapIntervalSGI = NULL;
 	}
 	if ( !glXExtensionSupported(this, "GLX_MESA_swap_control") ) {