diff --git a/install.yaml b/install.yaml
index f5d2f6e..61c2a46 100644
--- a/install.yaml
+++ b/install.yaml
@@ -3,7 +3,7 @@ name: ddev-backstopjs
 pre_install_actions:
   - test -d ${DDEV_APPROOT}/tests/backstop || mkdir -p ${DDEV_APPROOT}/tests/backstop
   - test -f "${DDEV_APPROOT}/tests/backstop/.gitignore" || printf "## ddev-generated\n**/bitmaps_test\n**/html_report\n" > ${DDEV_APPROOT}/tests/backstop/.gitignore
-  - grep -q "## ddev-generated" ${DDEV_APPROOT}/tests/backstop/.gitignore && printf "## ddev-generated\n**/bitmaps_test\n**/html_report\n" > ${DDEV_APPROOT}/tests/backstop/.gitignore
+  - grep -q "## ddev-generated" ${DDEV_APPROOT}/tests/backstop/.gitignore && printf "## ddev-generated\n**/bitmaps_test\n**/html_report\n" > ${DDEV_APPROOT}/tests/backstop/.gitignore || true
 
 
 # list of files and directories listed that are copied into project .ddev directory