diff --git a/plugins/sudoers/ldap.c b/plugins/sudoers/ldap.c
index f0ec3c532..e52d026ec 100644
--- a/plugins/sudoers/ldap.c
+++ b/plugins/sudoers/ldap.c
@@ -1248,6 +1248,7 @@ ldap_to_sudoers(LDAP *ld, struct ldap_result *lres,
     /* We only have a single userspec */
     if ((us = calloc(1, sizeof(*us))) == NULL)
 	goto oom;
+    us->file = rcstr_dup("LDAP");
     TAILQ_INIT(&us->users);
     TAILQ_INIT(&us->privileges);
     STAILQ_INIT(&us->comments);
diff --git a/plugins/sudoers/parse.c b/plugins/sudoers/parse.c
index 7a1c07e24..06f239e24 100644
--- a/plugins/sudoers/parse.c
+++ b/plugins/sudoers/parse.c
@@ -161,7 +161,8 @@ sudoers_lookup_check(struct sudo_nss *nss, struct passwd *pw,
 			*matching_cs = cs;
 			*defs = &priv->defaults;
 			sudo_debug_printf(SUDO_DEBUG_DEBUG|SUDO_DEBUG_LINENO,
-			    "userspec matched @ %s:%d %s", us->file, us->lineno,
+			    "userspec matched @ %s:%d %s",
+			    us->file ? us->file : "???", us->lineno,
 			    cmnd_match ? "allowed" : "denied");
 			debug_return_int(cmnd_match);
 		    }
diff --git a/plugins/sudoers/sssd.c b/plugins/sudoers/sssd.c
index 3000ca7e0..b52fec3fa 100644
--- a/plugins/sudoers/sssd.c
+++ b/plugins/sudoers/sssd.c
@@ -364,6 +364,7 @@ sss_to_sudoers(struct sudo_sss_handle *handle,
     /* We only have a single userspec */
     if ((us = calloc(1, sizeof(*us))) == NULL)
 	goto oom;
+    us->file = rcstr_dup("SSSD");
     TAILQ_INIT(&us->users);
     TAILQ_INIT(&us->privileges);
     STAILQ_INIT(&us->comments);