diff --git a/libc/include/errno.h b/libc/include/errno.h
index 63b06109..f6e79aa2 100644
--- a/libc/include/errno.h
+++ b/libc/include/errno.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2011, 2012, 2013, 2014, 2015, 2016 Jonas 'Sortie' Termansen.
+ * Copyright (c) 2011-2016, 2020 Jonas 'Sortie' Termansen.
  *
  * Permission to use, copy, modify, and distribute this software for any
  * purpose with or without fee is hereby granted, provided that the above
@@ -24,7 +24,6 @@
 
 #define ENOTBLK 12
 #define ENODEV 13
-#define EWOULDBLOCK 14
 #define EBADF 15
 #define EOVERFLOW 16
 #define ENOENT 17
@@ -112,6 +111,7 @@
 #define ENOMOUNT 99
 
 #define EOPNOTSUPP ENOTSUP
+#define EWOULDBLOCK EAGAIN
 
 #ifdef __cplusplus
 extern "C" {
diff --git a/libc/string/strerror.c b/libc/string/strerror.c
index 0b288e0d..affb27a4 100644
--- a/libc/string/strerror.c
+++ b/libc/string/strerror.c
@@ -27,7 +27,6 @@ const char* sortix_strerror(int errnum)
 	{
 	case ENOTBLK: return "Block device required";
 	case ENODEV: return "No such device";
-	case EWOULDBLOCK: return "Operation would block";
 	case EBADF: return "Bad file descriptor";
 	case EOVERFLOW: return "Value too large to be stored in data type";
 	case ENOENT: return "No such file or directory";