diff --git a/stack.sh b/stack.sh
index e9831d5..abd6a4d 100755
--- a/stack.sh
+++ b/stack.sh
@@ -42,6 +42,8 @@
     set -o nounset
 fi
 
+# Set start of devstack timestamp
+DEVSTACK_START_TIME=$(date +%s)
 
 # Configuration
 # =============
@@ -481,11 +483,14 @@
 
     if [[ $r -ne 0 ]]; then
         echo "Error on exit"
+        generate-subunit $DEVSTACK_START_TIME $SECONDS 'fail' >> ${SUBUNIT_OUTPUT}
         if [[ -z $LOGDIR ]]; then
             $TOP_DIR/tools/worlddump.py
         else
             $TOP_DIR/tools/worlddump.py -d $LOGDIR
         fi
+    else
+        generate-subunit $DEVSTACK_START_TIME $SECONDS >> ${SUBUNIT_OUTPUT}
     fi
 
     exit $r
@@ -710,6 +715,9 @@
     PYPI_ALTERNATIVE_URL=${PYPI_ALTERNATIVE_URL:-""} $TOP_DIR/tools/install_pip.sh
 fi
 
+# Install subunit for the subunit output stream
+pip_install -U os-testr
+
 TRACK_DEPENDS=${TRACK_DEPENDS:-False}
 
 # Install Python packages into a virtualenv so that we can track them