diff --git a/arch/arm/mach-keystone/cmd_clock.c b/arch/arm/mach-keystone/cmd_clock.c
index e9ecc05..7b94a80 100644
--- a/arch/arm/mach-keystone/cmd_clock.c
+++ b/arch/arm/mach-keystone/cmd_clock.c
@@ -8,6 +8,7 @@
 
 #include <vsprintf.h>
 #include <command.h>
+#include <linux/string.h>
 #include <asm/arch/hardware.h>
 #include <asm/arch/clock.h>
 #include <asm/arch/psc_defs.h>