diff --git a/drivers/media/platform/mem2mem_testdev.c b/drivers/media/platform/mem2mem_testdev.c
index 2f5669d20a87b24b977ea350a9630f6bb0100656..ccbe8750d259f153a73f2c43b8c17e667370ce9f 100644
--- a/drivers/media/platform/mem2mem_testdev.c
+++ b/drivers/media/platform/mem2mem_testdev.c
@@ -70,7 +70,7 @@ MODULE_VERSION("0.1.1");
 	v4l2_dbg(1, 1, &dev->v4l2_dev, "%s: " fmt, __func__, ## arg)
 
 
-void m2mtest_dev_release(struct device *dev)
+static void m2mtest_dev_release(struct device *dev)
 {}
 
 static struct platform_device m2mtest_pdev = {