diff --git a/arch/powerpc/kernel/syscalls.c b/arch/powerpc/kernel/syscalls.c
index f72ced11212d500a70e7569568f61e449fb72b24..91b93d917b64aea53aa5ccc54ff8bdfb9c2441b9 100644
--- a/arch/powerpc/kernel/syscalls.c
+++ b/arch/powerpc/kernel/syscalls.c
@@ -247,7 +247,7 @@ long ppc64_personality(unsigned long personality)
 #define OVERRIDE_MACHINE    0
 #endif
 
-static inline int override_machine(char *mach)
+static inline int override_machine(char __user *mach)
 {
 	if (OVERRIDE_MACHINE) {
 		/* change ppc64 to ppc */