diff --git a/exercises/euca.sh b/exercises/euca.sh
index 46e4025..7b35f6f 100755
--- a/exercises/euca.sh
+++ b/exercises/euca.sh
@@ -169,7 +169,7 @@
 # case changed with bug/836978. Requesting the status of an invalid instance
 # will now return an error message including the instance id, so we need to
 # filter that out.
-if ! timeout $TERMINATE_TIMEOUT sh -c "while euca-describe-instances $INSTANCE | grep -ve \"\\\(InstanceNotFound\\\|InvalidInstanceId\[.\]NotFound\\\)\" | grep -q $INSTANCE; do sleep 1; done"; then
+if ! timeout $TERMINATE_TIMEOUT sh -c "while euca-describe-instances $INSTANCE | grep -ve \"\\\(InstanceNotFound\\\|InvalidInstanceID\[.\]NotFound\\\)\" | grep -q $INSTANCE; do sleep 1; done"; then
     echo "server didn't terminate within $TERMINATE_TIMEOUT seconds"
     exit 1
 fi