diff --git a/src/compiler/build_tables/rule_transitions.cpp b/src/compiler/build_tables/rule_transitions.cpp
index aa61bdad..3f6ec3e2 100644
--- a/src/compiler/build_tables/rule_transitions.cpp
+++ b/src/compiler/build_tables/rule_transitions.cpp
@@ -26,6 +26,14 @@ namespace tree_sitter {
                 return choice({ left, right });
             });
         }
+        
+        template<typename T>
+        transition_map<T, Rule> map_transitions(const transition_map<T, Rule> &initial, std::function<const rule_ptr(rule_ptr)> map_fn) {
+            transition_map<T, Rule> result;
+            for (auto &pair : initial)
+                result.add(pair.first, map_fn(pair.second));
+            return result;
+        }
 
         template<typename T>
         class TransitionsVisitor : public rules::Visitor {
@@ -59,7 +67,7 @@ namespace tree_sitter {
             }
 
             void visit(const Seq *rule) {
-                value = transitions(rule->left).template map<Rule>([&](const rule_ptr left_rule) -> rule_ptr {
+                value = map_transitions(transitions(rule->left), [&](const rule_ptr left_rule) -> rule_ptr {
                     if (is_blank(left_rule))
                         return rule->right;
                     else
@@ -71,7 +79,7 @@ namespace tree_sitter {
             }
             
             void visit(const Repeat *rule) {
-                value = transitions(rule->content).template map<Rule>([&](const rule_ptr &value) -> rule_ptr {
+                value = map_transitions(transitions(rule->content), [&](const rule_ptr &value) -> rule_ptr {
                     return seq({ value, choice({ rule->copy(), blank() }) });
                 });
             }
diff --git a/src/compiler/build_tables/transition_map.h b/src/compiler/build_tables/transition_map.h
index a9311eb4..3de5daa5 100644
--- a/src/compiler/build_tables/transition_map.h
+++ b/src/compiler/build_tables/transition_map.h
@@ -43,16 +43,6 @@ namespace tree_sitter {
             return TValuePtr();
         }
         
-        template<typename NewV>
-        transition_map<TKey, NewV> map(std::function<const std::shared_ptr<NewV>(TValuePtr)> map_fn) {
-            transition_map<TKey, NewV> result;
-            for (pair_type pair : *this) {
-                auto new_value = map_fn(pair.second);
-                result.add(pair.first, new_value);
-            }
-            return result;
-        }
-
 #pragma mark - Container
 
         typedef typename contents_type::const_iterator const_iterator;