diff --git a/include/fmt/posix.h b/include/fmt/posix.h
index 31bc7175..715931f3 100644
--- a/include/fmt/posix.h
+++ b/include/fmt/posix.h
@@ -8,7 +8,7 @@
 #ifndef FMT_POSIX_H_
 #define FMT_POSIX_H_
 
-#ifdef __MINGW32__
+#if defined(__MINGW32__) || defined(__CYGWIN__)
 // Workaround MinGW bug https://sourceforge.net/p/mingw/bugs/2024/.
 # undef __STRICT_ANSI__
 #endif
@@ -352,7 +352,8 @@ class File {
 // Returns the memory page size.
 long getpagesize();
 
-#if (defined(LC_NUMERIC_MASK) || defined(_MSC_VER)) && !defined(__ANDROID__)
+#if (defined(LC_NUMERIC_MASK) || defined(_MSC_VER)) && \
+    !defined(__ANDROID__) && !defined(__CYGWIN__)
 # define FMT_LOCALE
 #endif