diff --git a/src/at.c b/src/at.c
index af26f51..5c35844 100644
--- a/src/at.c
+++ b/src/at.c
@@ -48,8 +48,11 @@ static int configure_serial(const char *tty)
     return fd;
 }
 
-static void at_free_command(struct AtCommand *at_cmd, struct EG25Manager *manager)
+static void at_free_command(gpointer cmd, gpointer data)
 {
+    struct AtCommand *at_cmd = cmd;
+    struct EG25Manager *manager = data;
+
     if (!at_cmd)
         return;