diff --git a/src/lib/icu/Transliterator.hxx b/src/lib/icu/Transliterator.hxx
index 38ab86e9d..cad083fec 100644
--- a/src/lib/icu/Transliterator.hxx
+++ b/src/lib/icu/Transliterator.hxx
@@ -22,6 +22,7 @@
 #include <unicode/utrans.h>
 
 #include <utility> // for std::exchange()
+#include <string_view>
 
 template<class T> class AllocatedArray;