diff --git a/plat/xilinx/zynqmp/pm_service/pm_api_clock.c b/plat/xilinx/zynqmp/pm_service/pm_api_clock.c
index c6bed7d..0099070 100644
--- a/plat/xilinx/zynqmp/pm_service/pm_api_clock.c
+++ b/plat/xilinx/zynqmp/pm_service/pm_api_clock.c
@@ -2400,7 +2400,7 @@
 {
 	unsigned int i;
 
-	for (i = 0; i < ARRAY_SIZE(pm_clk_invalid_list); i++)
+	for (i = 0U; i < ARRAY_SIZE(pm_clk_invalid_list); i++)
 		if (pm_clk_invalid_list[i] == clock_id)
 			return 0;