diff --git a/proxies/jack_proxy.c b/proxies/jack_proxy.c
index c5ad06e7..80c9cfdd 100644
--- a/proxies/jack_proxy.c
+++ b/proxies/jack_proxy.c
@@ -159,7 +159,15 @@ jack_proxy_get_client_pid(
   uint64_t client_id,
   pid_t * pid_ptr)
 {
-  return dbus_call(JACKDBUS_SERVICE_NAME, JACKDBUS_OBJECT_PATH, JACKDBUS_IFACE_PATCHBAY, "GetClientPID", "t", &client_id, "x", pid_ptr);
+  int64_t pid;
+
+  if (!dbus_call(JACKDBUS_SERVICE_NAME, JACKDBUS_OBJECT_PATH, JACKDBUS_IFACE_PATCHBAY, "GetClientPID", "t", &client_id, "x", &pid))
+  {
+    return false;
+  }
+
+  *pid_ptr = pid;
+  return true;
 }
 
 bool