diff --git a/src/hb-icu.cc b/src/hb-icu.cc
index 24cec9d7266bb01a98c084280768ade6ef15b57e..ee54721fd4c3c6a09701eb9a328fe1aed0d5a64d 100644
--- a/src/hb-icu.cc
+++ b/src/hb-icu.cc
@@ -36,6 +36,7 @@
 #include <unicode/uchar.h>
 #include <unicode/unorm.h>
 #include <unicode/ustring.h>
+#include <unicode/utf16.h>
 #include <unicode/uversion.h>