diff --git a/arch/mips/au1000/common/usbdev.c b/arch/mips/au1000/common/usbdev.c
index 0b21bed7ee55..2cab7629702c 100644
--- a/arch/mips/au1000/common/usbdev.c
+++ b/arch/mips/au1000/common/usbdev.c
@@ -348,7 +348,7 @@ endpoint_stall(endpoint_t * ep)
 {
 	u32 cs;
 
-	warn(__FUNCTION__);
+	warn("%s", __FUNCTION__);
 
 	cs = au_readl(ep->reg->ctrl_stat) | USBDEV_CS_STALL;
 	au_writel(cs, ep->reg->ctrl_stat);
@@ -360,7 +360,7 @@ endpoint_unstall(endpoint_t * ep)
 {
 	u32 cs;
 
-	warn(__FUNCTION__);
+	warn("%s", __FUNCTION__);
 
 	cs = au_readl(ep->reg->ctrl_stat) & ~USBDEV_CS_STALL;
 	au_writel(cs, ep->reg->ctrl_stat);