diff --git a/headers/private/locale/ICUWrapper.h b/headers/private/locale/ICUWrapper.h
index 7bedf6099f..5667c3dcbb 100644
--- a/headers/private/locale/ICUWrapper.h
+++ b/headers/private/locale/ICUWrapper.h
@@ -10,6 +10,7 @@
 #ifndef __ICU_WRAPPER_H__
 #define __ICU_WRAPPER_H__
 
+#include <String.h>
 
 #include <unicode/bytestream.h>