diff --git a/include/errno.h b/include/errno.h
index 4d3bfe47..6968928d 100644
--- a/include/errno.h
+++ b/include/errno.h
@@ -39,7 +39,6 @@ extern "C" {
 #define EOVERFLOW       75
 #define EILSEQ          84
 #define EDESTADDRREQ    89
-#define EMSGSIZE        90
 #define EPFNOSUPPORT    96
 #define EADDRNOTAVAIL   99
 #define ENETDOWN        100