diff --git a/BUILD.gn b/BUILD.gn
index 27a14df..296171d 100644
--- a/BUILD.gn
+++ b/BUILD.gn
@@ -17,24 +17,28 @@ import("//build_overrides/vulkan_headers.gni")
 
 config("vulkan_headers_config") {
   include_dirs = [ "include" ]
+  defines = []
 
   if (is_win) {
-    defines = [ "VK_USE_PLATFORM_WIN32_KHR" ]
+    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" ]
+  }
+  if (defined(vulkan_use_wayland) && vulkan_use_wayland) {
+    defines += [ "VK_USE_PLATFORM_WAYLAND_KHR" ]
   }
   if (is_android) {
-    defines = [ "VK_USE_PLATFORM_ANDROID_KHR" ]
+    defines += [ "VK_USE_PLATFORM_ANDROID_KHR" ]
   }
   if (is_fuchsia) {
-    defines = [ "VK_USE_PLATFORM_FUCHSIA" ]
+    defines += [ "VK_USE_PLATFORM_FUCHSIA" ]
   }
   if (is_mac) {
-    defines = [ "VK_USE_PLATFORM_METAL_EXT" ]
+    defines += [ "VK_USE_PLATFORM_METAL_EXT" ]
   }
   if (defined(is_ggp) && is_ggp) {
-    defines = [ "VK_USE_PLATFORM_GGP" ]
+    defines += [ "VK_USE_PLATFORM_GGP" ]
   }
 }