diff --git a/port/port_posix.h b/port/port_posix.h
index 45a9cf3b2..ff8d4af4b 100644
--- a/port/port_posix.h
+++ b/port/port_posix.h
@@ -53,7 +53,7 @@
 
 #if defined(OS_MACOSX) || defined(OS_SOLARIS) || defined(OS_FREEBSD) ||\
     defined(OS_NETBSD) || defined(OS_OPENBSD) || defined(OS_DRAGONFLYBSD) ||\
-    defined(OS_ANDROID)
+    defined(OS_ANDROID) || defined(OS_CYGWIN)
 // Use fread/fwrite/fflush on platforms without _unlocked variants
 #define fread_unlocked fread
 #define fwrite_unlocked fwrite
diff --git a/util/env_posix.cc b/util/env_posix.cc
index 9b7f13fe1..371dcf15b 100644
--- a/util/env_posix.cc
+++ b/util/env_posix.cc
@@ -186,11 +186,7 @@ class PosixSequentialFile: public SequentialFile {
     Status s;
     size_t r = 0;
     do {
-#ifndef CYGWIN
       r = fread_unlocked(scratch, 1, n, file_);
-#else
-      r = fread(scratch, 1, n, file_);
-#endif
     } while (r == 0 && ferror(file_) && errno == EINTR);
     IOSTATS_ADD(bytes_read, r);
     *result = Slice(scratch, r);