--- a/libnemo-private/nemo-action.c
+++ b/libnemo-private/nemo-action.c
@@ -1322,6 +1322,7 @@ check_gsettings_condition (NemoAction *a
         g_strfreev (split);
         return FALSE;
     }
+    return 0;
 }
 
 static gboolean
--- a/libnemo-private/nemo-desktop-utils.c
+++ b/libnemo-private/nemo-desktop-utils.c
@@ -92,6 +92,7 @@ nemo_desktop_utils_get_primary_monitor (
             return i;
         }
     }
+    return -1;
 #else
     ensure_screen ();
 
--- a/libnemo-private/nemo-monitor.c
+++ b/libnemo-private/nemo-monitor.c
@@ -78,6 +78,7 @@ schedule_call_consume_changes (void)
       call_consume_changes_idle_id =
           g_idle_add (call_consume_changes_idle_cb, NULL);
   }
+  return 0;
 }
 
 static void