diff --git a/gdb/sh-stub.c b/gdb/sh-stub.c
index 86255b74e1..198de99d22 100644
--- a/gdb/sh-stub.c
+++ b/gdb/sh-stub.c
@@ -656,7 +656,7 @@ static void putpacket (register char *buffer)
             /* Do run length encoding */
             for (runlen = 0; runlen < 100; runlen ++) 
             {
-                if (src[0] != src[runlen]) 
+                if (src[0] != src[runlen] || runlen == 99) 
                 {
                     if (runlen > 3) 
                     {