diff --git a/lib/libutil/login_cap.3 b/lib/libutil/login_cap.3
index 960f6dea044d..a5334219d819 100644
--- a/lib/libutil/login_cap.3
+++ b/lib/libutil/login_cap.3
@@ -54,7 +54,7 @@
 .Fn login_getuserclass "const struct passwd *pwd"
 .Ft "const char *"
 .Fn login_getcapstr "login_cap_t *lc" "const char *cap" "const char *def" "const char *error"
-.Ft char **
+.Ft "const char **"
 .Fn login_getcaplist "login_cap_t *lc" "const char *cap" "const char *chars"
 .Ft "const char *"
 .Fn login_getpath "login_cap_t *lc" "const char *cap" "const char *error"