1 files changed, 4 insertions, 0 deletions
diff --git a/os/io.c b/os/io.c
index 956a53300..75aebcb5e 100644
--- a/os/io.c
+++ b/os/io.c
@@ -94,6 +94,7 @@ CallbackListPtr       FlushCallback;
  * systems are broken and return EWOULDBLOCK when they should return EAGAIN
  */
 #ifndef __UNIXOS2__
+#ifndef WIN32
 #if defined(EAGAIN) && defined(EWOULDBLOCK)
 #define ETEST(err) (err == EAGAIN || err == EWOULDBLOCK)
 #else
@@ -103,6 +104,9 @@ CallbackListPtr       FlushCallback;
 #define ETEST(err) (err == EWOULDBLOCK)
 #endif
 #endif
+#else /* WIN32 The socket errorcodes differ from the normal errors*/
+#define ETEST(err) (err == EAGAIN || err == WSAEWOULDBLOCK)
+#endif
 #else /* __UNIXOS2__  Writing to full pipes may return ENOSPC */
 #define ETEST(err) (err == EAGAIN || err == EWOULDBLOCK || err == ENOSPC)
 #endif