--- a/absl/time/internal/cctz/src/time_zone_lookup.cc
+++ b/absl/time/internal/cctz/src/time_zone_lookup.cc
@@ -47,6 +47,7 @@
 #include <wchar.h>
 #include <windows.globalization.h>
 #include <windows.h>
+#include <winstring.h>
 #endif
 #endif