diff --git a/tests/scripts/run_tests.sh b/tests/scripts/run_tests.sh
index 222d168..9f6e98a 100755
--- a/tests/scripts/run_tests.sh
+++ b/tests/scripts/run_tests.sh
@@ -227,6 +227,10 @@ if [ -z "$REPOS" ]; then
     exit 1
 fi
 
+# The c9s tmt systems have started using $stream in the repo urls as of 6/2024, substitute
+# 9-stream for this variable so that they can be passed to lorax
+sed -i 's/$stream/9-stream/g' /etc/yum.repos.d/*.repo
+
 # Run lorax using the host's repository configuration file
 if [ ! -e "$BOOTISO" ]; then
 	running "Build boot.iso with lorax"