diff --git a/src/win32_window.c b/src/win32_window.c
index 2ca7add6..14cf8cb9 100644
--- a/src/win32_window.c
+++ b/src/win32_window.c
@@ -1337,7 +1337,7 @@ static int createWindow(_GLFWwindow* window,
     {
         _glfwSetError(GLFW_PLATFORM_ERROR,
                       "glfwOpenWindow: Failed to convert title to wide string");
-        return;
+        return GL_FALSE;
     }
 
     window->Win32.handle = CreateWindowEx(window->Win32.dwExStyle,