diff --git a/lib/libugidfw/ugidfw.c b/lib/libugidfw/ugidfw.c
index 2b5d0d2f0f59..b31f5eab3061 100644
--- a/lib/libugidfw/ugidfw.c
+++ b/lib/libugidfw/ugidfw.c
@@ -553,9 +553,10 @@ bsde_parse_rule_string(const char *string, struct mac_bsdextended_rule *rule,
 }
 
 int
-bsde_get_mib(const char *string, int *name, int *namelen)
+bsde_get_mib(const char *string, int *name, size_t *namelen)
 {
-	int error, len;
+	size_t len;
+	int error;
 
 	len = *namelen;
 	error = sysctlnametomib(string, name, &len);
diff --git a/lib/libugidfw/ugidfw.h b/lib/libugidfw/ugidfw.h
index 5d3352d2b474..fa502b48c1e9 100644
--- a/lib/libugidfw/ugidfw.h
+++ b/lib/libugidfw/ugidfw.h
@@ -49,7 +49,7 @@ int	bsde_parse_rule(int argc, char *argv[],
 	    struct mac_bsdextended_rule *rule, size_t buflen, char *errstr);
 int	bsde_parse_rule_string(const char *string,
 	    struct mac_bsdextended_rule *rule, size_t buflen, char *errstr);
-int	bsde_get_mib(const char *string, int *name, int *namelen);
+int	bsde_get_mib(const char *string, int *name, size_t *namelen);
 int	bsde_get_rule_count(size_t buflen, char *errstr);
 int	bsde_get_rule_slots(size_t buflen, char *errstr);
 int	bsde_get_rule(int rulenum, struct mac_bsdextended_rule *rule,