diff --git a/security/device_cgroup.c b/security/device_cgroup.c
index fd764a0..1e2e28a 100644
--- a/security/device_cgroup.c
+++ b/security/device_cgroup.c
@@ -222,7 +222,7 @@
 #define DEVCG_DENY 2
 #define DEVCG_LIST 3
 
-#define MAJMINLEN 10
+#define MAJMINLEN 13
 #define ACCLEN 4
 
 static void set_access(char *acc, short access)
@@ -254,7 +254,7 @@
 	if (m == ~0)
 		sprintf(str, "*");
 	else
-		snprintf(str, MAJMINLEN, "%d", m);
+		snprintf(str, MAJMINLEN, "%u", m);
 }
 
 static int devcgroup_seq_read(struct cgroup *cgroup, struct cftype *cft,