diff --git a/tests/animated-resizing.c b/tests/animated-resizing.c
index c37106dda3..8660089276 100644
--- a/tests/animated-resizing.c
+++ b/tests/animated-resizing.c
@@ -66,7 +66,7 @@ ensure_resources(cairo_surface_t *target)
       }
 }
 
-static void
+static gboolean
 on_window_draw (GtkWidget *widget,
                 cairo_t   *cr)
 
@@ -108,6 +108,8 @@ on_window_draw (GtkWidget *widget,
     }
 
   g_rand_free(rand);
+
+  return FALSE;
 }
 
 static void
diff --git a/tests/video-timer.c b/tests/video-timer.c
index e665c6da7f..bc5de1e5fe 100644
--- a/tests/video-timer.c
+++ b/tests/video-timer.c
@@ -190,7 +190,7 @@ adjust_clock_for_phase (gint64 frame_clock_time,
 
 /* Drawing */
 
-static void
+static gboolean
 on_window_draw (GtkWidget *widget,
                 cairo_t   *cr)
 {
@@ -224,6 +224,8 @@ on_window_draw (GtkWidget *widget,
           displayed_frame->frame_counter = gdk_frame_clock_get_frame_counter (frame_clock);
         }
     }
+
+  return FALSE;
 }
 
 static void