diff --git a/include/proto/pattern.h b/include/proto/pattern.h
index 4a969ac..7855474 100644
--- a/include/proto/pattern.h
+++ b/include/proto/pattern.h
@@ -206,7 +206,8 @@
  */
 void pattern_init_expr(struct pattern_expr *expr);
 struct pattern_expr *pattern_lookup_expr(struct pattern_head *head, struct pat_ref *ref);
-struct pattern_expr *pattern_new_expr(struct pattern_head *head, struct pat_ref *ref, char **err);
+struct pattern_expr *pattern_new_expr(struct pattern_head *head, struct pat_ref *ref,
+                                      char **err, int *reuse);
 struct sample_storage **pattern_find_smp(struct pattern_expr *expr, struct pat_ref_elt *elt);
 int pattern_delete(struct pattern_expr *expr, struct pat_ref_elt *ref);