diff --git a/BUILD.gn b/BUILD.gn
index 7ec9577..11f1161 100644
--- a/BUILD.gn
+++ b/BUILD.gn
@@ -13,7 +13,10 @@ config("vulkan_headers_config") {
     defines += [ "VK_USE_PLATFORM_WIN32_KHR" ]
   }
   if (defined(vulkan_use_x11) && vulkan_use_x11) {
-    defines += [ "VK_USE_PLATFORM_XCB_KHR" ]
+    defines += [
+      "VK_USE_PLATFORM_XCB_KHR",
+      "VK_USE_PLATFORM_XLIB_KHR",
+    ]
   }
   if (defined(vulkan_use_wayland) && vulkan_use_wayland) {
     defines += [ "VK_USE_PLATFORM_WAYLAND_KHR" ]