diff -r 79fde1c67ed8 -r a50742e945c5 src/sim/serialize.hh
--- a/src/sim/serialize.hh	Wed Aug 13 06:57:36 2014 -0400
+++ b/src/sim/serialize.hh	Wed Feb 05 16:17:41 2014 -0600
@@ -58,7 +58,7 @@
  * SimObject shouldn't cause the version number to increase, only changes to
  * existing objects such as serializing/unserializing more state, changing sizes
  * of serialized arrays, etc. */
-static const uint64_t gem5CheckpointVersion = 0x000000000000000b;
+static const uint64_t gem5CheckpointVersion = 0x000000000000000c;
 
 template <class T>
 void paramOut(std::ostream &os, const std::string &name, const T &param);
diff -r 79fde1c67ed8 -r a50742e945c5 util/cpt_upgrader.py
--- a/util/cpt_upgrader.py	Wed Aug 13 06:57:36 2014 -0400
+++ b/util/cpt_upgrader.py	Wed Feb 05 16:17:41 2014 -0600
@@ -569,6 +569,12 @@
         else:
             continue
 
+# The change between versions C and D is the addition of support for multiple
+# event queues, so for old checkpoints we must specify that there's only one.
+def from_B(cpt):
+    cpt.set('Globals', 'numMainEventQueues', '1')
+
+
 migrations = []
 migrations.append(from_0)
 migrations.append(from_1)
@@ -581,6 +587,7 @@
 migrations.append(from_8)
 migrations.append(from_9)
 migrations.append(from_A)
+migrations.append(from_B)
 
 verbose_print = False