diff --git a/spec/helpers/tree_helpers.cc b/spec/helpers/tree_helpers.cc
index e4ae4dab..574fb801 100644
--- a/spec/helpers/tree_helpers.cc
+++ b/spec/helpers/tree_helpers.cc
@@ -7,14 +7,13 @@ using std::string;
 using std::to_string;
 using std::ostream;
 
-static const char *symbol_names[24] = {
+const char *symbol_names[24] = {
   "ERROR", "END",  "two", "three", "four", "five", "six", "seven", "eight",
   "nine", "ten", "eleven", "twelve", "thirteen", "fourteen", "fifteen",
   "sixteen", "seventeen", "eighteen", "nineteen", "twenty", "twenty-one",
   "twenty-two", "twenty-three"
 };
 
-
 TSTree ** tree_array(std::vector<TSTree *> trees) {
   TSTree ** result = (TSTree **)calloc(trees.size(), sizeof(TSTree *));
   for (size_t i = 0; i < trees.size(); i++)
diff --git a/spec/helpers/tree_helpers.h b/spec/helpers/tree_helpers.h
index c151c9ba..acd3f0a2 100644
--- a/spec/helpers/tree_helpers.h
+++ b/spec/helpers/tree_helpers.h
@@ -5,6 +5,7 @@
 #include <vector>
 #include <string>
 
+extern const char *symbol_names[24];
 TSTree ** tree_array(std::vector<TSTree *> trees);
 
 std::ostream &operator<<(std::ostream &stream, const TSTree *tree);