diff --git a/include/proto/pattern.h b/include/proto/pattern.h
index 40e87b8..4a969ac 100644
--- a/include/proto/pattern.h
+++ b/include/proto/pattern.h
@@ -69,6 +69,7 @@
 int pat_idx_list_reg(struct pattern_expr *expr, struct pattern *pat, char **err);
 int pat_idx_tree_ip(struct pattern_expr *expr, struct pattern *pat, char **err);
 int pat_idx_tree_str(struct pattern_expr *expr, struct pattern *pat, char **err);
+int pat_idx_tree_pfx(struct pattern_expr *expr, struct pattern *pat, char **err);
 
 /*
  *