diff --git a/arch/s390/mm/cmm.c b/arch/s390/mm/cmm.c
index 9d84a1feefef..76741306af2a 100644
--- a/arch/s390/mm/cmm.c
+++ b/arch/s390/mm/cmm.c
@@ -257,8 +257,8 @@ static int cmm_pages_handler(ctl_table *ctl, int write, void __user *buffer,
 			     size_t *lenp, loff_t *ppos)
 {
 	char buf[16], *p;
+	unsigned int len;
 	long nr;
-	int len;
 
 	if (!*lenp || (*ppos && !write)) {
 		*lenp = 0;
@@ -298,7 +298,7 @@ static int cmm_timeout_handler(ctl_table *ctl, int write,  void __user *buffer,
 {
 	char buf[64], *p;
 	long nr, seconds;
-	int len;
+	unsigned int len;
 
 	if (!*lenp || (*ppos && !write)) {
 		*lenp = 0;