diff --git a/src/tree_schema_internal.h b/src/tree_schema_internal.h
index 9c59550..d441b2d 100644
--- a/src/tree_schema_internal.h
+++ b/src/tree_schema_internal.h
@@ -578,5 +578,5 @@
 /**
  * @brief match yang keyword
  */
-enum yang_keyword match_keyword(const char *data, size_t len);
+enum yang_keyword match_keyword(const char *data, size_t len, size_t prefix_len);
 #endif /* LY_TREE_SCHEMA_INTERNAL_H_ */