diff --git a/gatchat/gat.h b/gatchat/gat.h
index ddf86953..f0673892 100644
--- a/gatchat/gat.h
+++ b/gatchat/gat.h
@@ -32,6 +32,7 @@ typedef void (*GAtDisconnectFunc)(gpointer user_data);
 typedef void (*GAtReceiveFunc)(const unsigned char *data, gsize size,
 							gpointer user_data);
 typedef void (*GAtDebugFunc)(const char *str, gpointer user_data);
+typedef void (*GAtSuspendFunc)(gpointer user_data);
 
 #ifdef __cplusplus
 }