diff --git a/gdbstub.c b/gdbstub.c
index 4cf8af3..ce304ff 100644
--- a/gdbstub.c
+++ b/gdbstub.c
@@ -3171,7 +3171,7 @@
     }
 }
 
-static void gdb_chr_event(void *opaque, int event)
+static void gdb_chr_event(void *opaque, QEMUChrEvent event)
 {
     int i;
     GDBState *s = (GDBState *) opaque;