diff --git a/localeinit.c b/localeinit.c
index 420484a463..51a06c5b1c 100644
--- a/localeinit.c
+++ b/localeinit.c
@@ -19,7 +19,7 @@
 #include <langinfo.h>
 #endif
 
-#if defined _WIN32
+#if defined _WIN32 || defined __CYGWIN__
 #define SIZEOF_CP_NAME ((sizeof(UINT) * 8 / 3) + 4)
 #define CP_FORMAT(buf, codepage) snprintf(buf, sizeof(buf), "CP%u", (codepage))
 #endif