diff --git a/plat/rockchip/rk3399/drivers/pmu/m0_ctl.c b/plat/rockchip/rk3399/drivers/pmu/m0_ctl.c
index d919fa1..cad76ac 100644
--- a/plat/rockchip/rk3399/drivers/pmu/m0_ctl.c
+++ b/plat/rockchip/rk3399/drivers/pmu/m0_ctl.c
@@ -45,10 +45,10 @@
 	/* set the execute address for M0 */
 	mmio_write_32(SGRF_BASE + SGRF_PMU_CON(3),
 		      BITS_WITH_WMASK((addr >> 12) & 0xffff,
-				      0xffff, 0));
+				      0xffffu, 0));
 	mmio_write_32(SGRF_BASE + SGRF_PMU_CON(7),
 		      BITS_WITH_WMASK((addr >> 28) & 0xf,
-				      0xf, 0));
+				      0xfu, 0));
 }
 
 void m0_start(void)