diff --git a/src/null_init.c b/src/null_init.c
index 7236c98c..23989176 100644
--- a/src/null_init.c
+++ b/src/null_init.c
@@ -73,6 +73,7 @@ GLFWbool _glfwConnectNull(int platformID, _GLFWplatform* platform)
         _glfwCreateWindowNull,
         _glfwDestroyWindowNull,
         _glfwSetWindowTitleNull,
+        _glfwSetWindowTitlebarColorNull,
         _glfwSetWindowIconNull,
         _glfwGetWindowPosNull,
         _glfwSetWindowPosNull,
diff --git a/src/window.c b/src/window.c
index 7aae3d1b..6ee09187 100644
--- a/src/window.c
+++ b/src/window.c
@@ -529,7 +529,7 @@ GLFWAPI void glfwSetWindowTitlebarColor(GLFWwindow* handle, int r, int g, int b,
     assert(window != NULL);
     assert(window != NULL);
     _GLFW_REQUIRE_INIT();
-    _glfw.platform.setWindowTitlebarColor(handle, r,g,b,a);
+    _glfw.platform.setWindowTitlebarColor(window, r,g,b,a);
 }
 GLFWAPI void glfwSetWindowIcon(GLFWwindow* handle,
                                int count, const GLFWimage* images)