diff --git a/src/hx/gc/Immix.cpp b/src/hx/gc/Immix.cpp
index 413e4f716..47fccd5a4 100644
--- a/src/hx/gc/Immix.cpp
+++ b/src/hx/gc/Immix.cpp
@@ -7,6 +7,7 @@
 #include "GcRegCapture.h"
 #include <hx/Unordered.h>
 
+#include <string>
 #include <stdlib.h>