diff --git a/lib/hdb/hdb-ldap.c b/lib/hdb/hdb-ldap.c
index 5cd097f5b..902426d12 100644
--- a/lib/hdb/hdb-ldap.c
+++ b/lib/hdb/hdb-ldap.c
@@ -366,6 +366,7 @@ LDAP_get_generalized_time_value(HDB * db, LDAPMessage * entry,
     if (ret)
 	return ret;
 
+    memset(&tm, 0, sizeof tm);
     tmp = strptime(gentime, "%Y%m%d%H%M%SZ", &tm);
     if (tmp == NULL) {
 	free(gentime);