diff --git a/cfg/gtk.cfg b/cfg/gtk.cfg
index 4d4e8f3e3..6a33575d6 100644
--- a/cfg/gtk.cfg
+++ b/cfg/gtk.cfg
@@ -5,6 +5,7 @@
   <define name="g_return_val_if_fail(expr, val)" value="do{if(!(expr)){return val;}}while(0)"/>
   <define name="g_return_if_reached()" value="do{return;}while(0)"/>
   <define name="g_return_val_if_reached(val)" value="do{return val;}while(0)"/>
+  <define name="G_CALLBACK(cb)" value="cb"/>
   <define name="G_LIKELY(expr)" value="(expr)"/>
   <define name="G_UNLIKELY(expr)" value="(expr)"/>
   <memory>