diff --git a/arch/s390/mm/fault.c b/arch/s390/mm/fault.c
index 8b924b359774..d855cdbf8fb8 100644
--- a/arch/s390/mm/fault.c
+++ b/arch/s390/mm/fault.c
@@ -253,7 +253,10 @@ static int signal_return(struct mm_struct *mm, struct pt_regs *regs,
 			 unsigned long address, unsigned long error_code)
 {
 	u16 instruction;
-	int rc, compat;
+	int rc;
+#ifdef CONFIG_COMPAT
+	int compat;
+#endif
 
 	pagefault_disable();
 	rc = __get_user(instruction, (u16 __user *) regs->psw.addr);