diff --git a/velox/type/Tokenizer.h b/velox/type/Tokenizer.h
index 56380f0aead26..8b3779e83af74 100644
--- a/velox/type/Tokenizer.h
+++ b/velox/type/Tokenizer.h
@@ -41,6 +41,8 @@ class Tokenizer {
 
   std::unique_ptr<Subfield::PathElement> next();
 
+  bool isUnquotedPathCharacter(char c);
+
  private:
   const char DOT = '.';
   const char QUOTE = '\"';
@@ -76,8 +78,6 @@ class Tokenizer {
 
   void invalidSubfieldPath();
 
-  bool isUnquotedPathCharacter(char c);
-
   bool isUnquotedSubscriptCharacter(char c);
 
   void nextCharacter();