diff --git a/servers/slapd/schema_init.c b/servers/slapd/schema_init.c
index d7856f6de8..36e80c0490 100644
--- a/servers/slapd/schema_init.c
+++ b/servers/slapd/schema_init.c
@@ -4377,7 +4377,7 @@ serialNumberAndIssuerSerialCheck(
 	if ( in->bv_len < 3 ) return LDAP_INVALID_SYNTAX;
 
 	/* no old format */
-	if ( in->bv_val[0] != '{' && in->bv_val[in->bv_len-1] != '}' ) return LDAP_INVALID_SYNTAX;
+	if ( in->bv_val[0] != '{' || in->bv_val[in->bv_len-1] != '}' ) return LDAP_INVALID_SYNTAX;
 
 	x.bv_val++;
 	x.bv_len -= 2;