diff --git a/bochs/cpu/fetchdecode.cc b/bochs/cpu/fetchdecode.cc
index 76493dff3..38653b62c 100644
--- a/bochs/cpu/fetchdecode.cc
+++ b/bochs/cpu/fetchdecode.cc
@@ -1,5 +1,5 @@
 /////////////////////////////////////////////////////////////////////////
-// $Id: fetchdecode.cc,v 1.232 2009-11-05 21:07:18 sshwarts Exp $
+// $Id: fetchdecode.cc,v 1.233 2009-11-06 18:19:01 sshwarts Exp $
 /////////////////////////////////////////////////////////////////////////
 //
 //  Copyright (C) 2001  MandrakeSoft S.A.
@@ -2528,7 +2528,7 @@ fetch_b1:
       return(0);
     case 0xf2: // REPNE/REPNZ
     case 0xf3: // REP/REPE/REPZ
-      sse_prefix = b1 & 0xf;
+      sse_prefix = b1 & 3;
       i->setRepUsed(b1 & 3);
       if (ilen < remain) {
         goto fetch_b1;
diff --git a/bochs/cpu/fetchdecode64.cc b/bochs/cpu/fetchdecode64.cc
index 24c00dcd4..6a6f68eb9 100644
--- a/bochs/cpu/fetchdecode64.cc
+++ b/bochs/cpu/fetchdecode64.cc
@@ -1,5 +1,5 @@
 /////////////////////////////////////////////////////////////////////////
-// $Id: fetchdecode64.cc,v 1.234 2009-11-05 21:07:18 sshwarts Exp $
+// $Id: fetchdecode64.cc,v 1.235 2009-11-06 18:19:01 sshwarts Exp $
 /////////////////////////////////////////////////////////////////////////
 //
 //  Copyright (C) 2001  MandrakeSoft S.A.
@@ -3417,7 +3417,7 @@ fetch_b1:
     case 0xf2: // REPNE/REPNZ
     case 0xf3: // REP/REPE/REPZ
       rex_prefix = 0;
-      sse_prefix = b1 & 0xf;
+      sse_prefix = b1 & 3;
       i->setRepUsed(b1 & 3);
       if (ilen < remain) {
         goto fetch_b1;