diff --git a/os/io.c b/os/io.c
index 5ba1e86b1..be85226dd 100644
--- a/os/io.c
+++ b/os/io.c
@@ -116,7 +116,6 @@ static OsCommPtr AvailableInput = (OsCommPtr) NULL;
 				  lswapl(((xBigReq *)(req))->length) : \
 				  ((xBigReq *)(req))->length)
 
-#define MAX_TIMES_PER         10
 #define BUFSIZE 16384
 #define BUFWATERMARK 32768