diff --git a/servers/slapd/back-ldbm/filterindex.c b/servers/slapd/back-ldbm/filterindex.c
index 1d74d15bec..7ba65aae25 100644
--- a/servers/slapd/back-ldbm/filterindex.c
+++ b/servers/slapd/back-ldbm/filterindex.c
@@ -655,6 +655,7 @@ approx_candidates(
 		save = idl;
 		idl = idl_intersection( be, idl, tmp );
 		idl_free( save );
+		idl_free( tmp );
 
 		if( idl == NULL ) break;
 	}
@@ -897,6 +898,7 @@ substring_candidates(
 		save = idl;
 		idl = idl_intersection( be, idl, tmp );
 		idl_free( save );
+		idl_free( tmp );
 
 		if( idl == NULL ) break;
 	}