diff --git a/interop/src/cpp/napi/convertors-napi.h b/interop/src/cpp/napi/convertors-napi.h
index b25efe1d095db909b296e96cf907f844a318a32c..9b785b1072517793c691d5a93a449b43bd6c9f46 100644
--- a/interop/src/cpp/napi/convertors-napi.h
+++ b/interop/src/cpp/napi/convertors-napi.h
@@ -19,6 +19,7 @@
 #ifdef KOALA_NAPI
 
 #include <math.h>
+#include <unordered_map>
 
 #include "napi.h"