diff --git a/glfw/egl_context.c b/glfw/egl_context.c
index 38431ae06..9008cba60 100644
--- a/glfw/egl_context.c
+++ b/glfw/egl_context.c
@@ -223,6 +223,7 @@ static int extensionSupportedEGL(const char* extension)
 static GLFWglproc getProcAddressEGL(const char* procname)
 {
     _GLFWwindow* window = _glfwPlatformGetTls(&_glfw.contextSlot);
+    assert(window != NULL);
 
     if (window->context.egl.client)
     {