diff --git a/gatchat/gatmux.c b/gatchat/gatmux.c
index d492edb5..5867b37e 100644
--- a/gatchat/gatmux.c
+++ b/gatchat/gatmux.c
@@ -30,6 +30,8 @@
 #include <string.h>
 #include <alloca.h>
 
+#pragma GCC diagnostic ignored "-Wcast-function-type"
+
 #include <glib.h>
 
 #include "ringbuffer.h"