diff --git a/src/glx_context.c b/src/glx_context.c
index fdc97bb8e..aaa2c8bd0 100644
--- a/src/glx_context.c
+++ b/src/glx_context.c
@@ -483,7 +483,7 @@ GLFWbool _glfwCreateContextGLX(_GLFWwindow* window,
     if (ctxconfig->share)
         share = ctxconfig->share->context.glx.handle;
 
-    if (!chooseGLXFBConfig(fbconfig, &native, window->transparent))
+    if (!chooseGLXFBConfig(fbconfig, &native, fbconfig->transparent))
 
     {
         _glfwInputError(GLFW_FORMAT_UNAVAILABLE,