diff --git a/nim.cfg b/nim.cfg
index 6c66b43..f3ceead 100644
--- a/nim.cfg
+++ b/nim.cfg
@@ -37,6 +37,7 @@ out:"build/game"
 
 @if emscripten:
     passL:"-o build/web/game.js"
+    passC:"-DGLFW_KEYMAP"
     d:opengl_es
     noMain:on
     nimcache:"tmp/emscripten"