diff --git a/test/test-migrate-fixtures.sh b/test/test-migrate-fixtures.sh
index 138fd4ff..25cc9266 100755
--- a/test/test-migrate-fixtures.sh
+++ b/test/test-migrate-fixtures.sh
@@ -198,7 +198,7 @@ make_bare() {
 #
 #   remove_and_create_local_repo "$reponame"
 remove_and_create_local_repo() {
-  local reponame="$(base64 < /dev/urandom | head -c 8 | sed -e 's/\///')-$1"
+  local reponame="$(base64 < /dev/urandom | head -c 8 | $SHASUM | cut -f 1 -d ' ')-$1"
 
   git init "$reponame"
   cd "$reponame"
@@ -209,7 +209,7 @@ remove_and_create_local_repo() {
 #
 #   remove_and_create_remote_repo "$reponame"
 remove_and_create_remote_repo() {
-  local reponame="$(base64 < /dev/urandom | head -c 8 | sed -e 's/\///')-$1"
+  local reponame="$(base64 < /dev/urandom | head -c 8 | $SHASUM | cut -f 1 -d ' ')-$1"
 
   setup_remote_repo "$reponame"
   clone_repo "$reponame" "$reponame"