diff --git a/drivers/staging/renesas/rcar/pfc/E3/pfc_init_e3.c b/drivers/staging/renesas/rcar/pfc/E3/pfc_init_e3.c
index c939c2271c44189731889bd198a17089a1db92fa..b63d6bb9eb1779ded764a28d9df2ffda20705370 100644
--- a/drivers/staging/renesas/rcar/pfc/E3/pfc_init_e3.c
+++ b/drivers/staging/renesas/rcar/pfc/E3/pfc_init_e3.c
@@ -287,8 +287,6 @@
 #define MOD_SEL1_SSI9_A		((uint32_t)0U << 4U)
 #define MOD_SEL1_SSI9_B		((uint32_t)1U << 4U)
 
-static void pfc_reg_write(uint32_t addr, uint32_t data);
-
 static void pfc_reg_write(uint32_t addr, uint32_t data)
 {
 	mmio_write_32(PFC_PMMR, ~data);