diff --git a/src/backends/meta-idle-monitor-private.h b/src/backends/meta-idle-monitor-private.h
index 93948b14b..cc08f8c8e 100644
--- a/src/backends/meta-idle-monitor-private.h
+++ b/src/backends/meta-idle-monitor-private.h
@@ -54,7 +54,6 @@ struct _MetaIdleMonitorClass
   GObjectClass parent_class;
 };
 
-void _meta_idle_monitor_watch_fire (MetaIdleMonitorWatch *watch);
 void meta_idle_monitor_reset_idletime (MetaIdleMonitor *monitor);
 
 #endif /* META_IDLE_MONITOR_PRIVATE_H */
diff --git a/src/backends/meta-idle-monitor.c b/src/backends/meta-idle-monitor.c
index e83d6c778..de1c7e0ba 100644
--- a/src/backends/meta-idle-monitor.c
+++ b/src/backends/meta-idle-monitor.c
@@ -54,8 +54,8 @@ static GParamSpec *obj_props[PROP_LAST];
 
 G_DEFINE_TYPE (MetaIdleMonitor, meta_idle_monitor, G_TYPE_OBJECT)
 
-void
-_meta_idle_monitor_watch_fire (MetaIdleMonitorWatch *watch)
+static void
+meta_idle_monitor_watch_fire (MetaIdleMonitorWatch *watch)
 {
   MetaIdleMonitor *monitor;
   guint id;
@@ -324,7 +324,7 @@ idle_monitor_dispatch_timeout (GSource     *source,
   if (ready_time > now)
     return G_SOURCE_CONTINUE;
 
-  _meta_idle_monitor_watch_fire (watch);
+  meta_idle_monitor_watch_fire (watch);
   g_source_set_ready_time (watch->timeout_source, -1);
 
   return G_SOURCE_CONTINUE;
@@ -511,7 +511,7 @@ meta_idle_monitor_reset_idletime (MetaIdleMonitor *monitor)
 
       if (watch->timeout_msec == 0)
         {
-          _meta_idle_monitor_watch_fire ((MetaIdleMonitorWatch *) watch);
+          meta_idle_monitor_watch_fire ((MetaIdleMonitorWatch *) watch);
         }
       else
         {