diff --git a/Tests/symbolTest.cpp b/Tests/symbolTest.cpp
index 285c172a..1656f526 100644
--- a/Tests/symbolTest.cpp
+++ b/Tests/symbolTest.cpp
@@ -4,6 +4,7 @@
 
 // a unit test made using the Catch framework in catch.hpp / tests.cpp.
 
+
 #include "catch.hpp"
 #include "madronalib.h"
 #include "testUtils.h"
diff --git a/source/app/MLSymbol.h b/source/app/MLSymbol.h
index 7ff2a75b..f1b43cd7 100644
--- a/source/app/MLSymbol.h
+++ b/source/app/MLSymbol.h
@@ -32,6 +32,7 @@
 #include <iostream>
 #include <mutex>
 #include <vector>
+#include <unordered_map>
 
 #include "MLText.h"