--- valgrind-3.2.3/VEX/priv/guest-amd64/toIR.c	(revision 1776)
+++ valgrind-3.2.3/VEX/priv/guest-amd64/toIR.c	(revision 1777)
@@ -8355,7 +8355,7 @@ DisResult disInstr_AMD64_WRK ( 
       as many invalid combinations as possible. */
    n_prefixes = 0;
    while (True) {
-      if (n_prefixes > 5) goto decode_failure;
+      if (n_prefixes > 7) goto decode_failure;
       pre = getUChar(delta);
       switch (pre) {
          case 0x66: pfx |= PFX_66; break;