diff --git a/py/mperrno.h b/py/mperrno.h
index f439f65554..0cad75a17c 100644
--- a/py/mperrno.h
+++ b/py/mperrno.h
@@ -122,7 +122,7 @@
 #define MP_EPIPE            EPIPE
 #define MP_EDOM             EDOM
 #define MP_ERANGE           ERANGE
-#define MP_EWOULDBLOCK      EAGAIN
+#define MP_EWOULDBLOCK      EWOULDBLOCK
 #define MP_EOPNOTSUPP       EOPNOTSUPP
 #define MP_EAFNOSUPPORT     EAFNOSUPPORT
 #define MP_EADDRINUSE       EADDRINUSE