diff --git a/include/tree_sitter/compiler.h b/include/tree_sitter/compiler.h
index f96b86c0..cff3f0d3 100644
--- a/include/tree_sitter/compiler.h
+++ b/include/tree_sitter/compiler.h
@@ -27,8 +27,8 @@ namespace tree_sitter {
 
     class Grammar {
     protected:
-        std::vector<std::string> ubiquitous_tokens_;
         const std::vector<std::pair<std::string, rules::rule_ptr>> rules_;
+        std::vector<std::string> ubiquitous_tokens_;
 
     public:
         Grammar(const std::vector<std::pair<std::string, rules::rule_ptr>> &rules);
diff --git a/src/compiler/grammar.cc b/src/compiler/grammar.cc
index f9140830..f2cce4f9 100644
--- a/src/compiler/grammar.cc
+++ b/src/compiler/grammar.cc
@@ -9,7 +9,8 @@ namespace tree_sitter {
     using rules::rule_ptr;
 
     Grammar::Grammar(const std::vector<std::pair<std::string, rules::rule_ptr>> &rules) :
-        rules_(rules) {}
+        rules_(rules),
+        ubiquitous_tokens_({}) {}
 
     bool Grammar::operator==(const Grammar &other) const {
         if (other.rules_.size() != rules_.size()) return false;