diff --git a/plans/integration/behave-createrepo_c.fmf b/plans/integration/behave-createrepo_c.fmf
index 5e9205eee..ee341eb0e 100644
--- a/plans/integration/behave-createrepo_c.fmf
+++ b/plans/integration/behave-createrepo_c.fmf
@@ -5,4 +5,4 @@ execute:
     script: |
         $TMT_PLANS_DATA/ci-dnf-stack/container-test \
         --suite createrepo_c \
-        -c container-test-$PACKIT_SOURCE_BRANCH-$PACKIT_TARGET_BRANCH run
+        -c container-test-${PACKIT_SOURCE_BRANCH,,?}-${PACKIT_TARGET_BRANCH,,?} run
diff --git a/plans/integration/behave-dnf.fmf b/plans/integration/behave-dnf.fmf
index e58ff5515..58428603e 100644
--- a/plans/integration/behave-dnf.fmf
+++ b/plans/integration/behave-dnf.fmf
@@ -4,5 +4,5 @@ execute:
     how: tmt
     script: |
         $TMT_PLANS_DATA/ci-dnf-stack/container-test \
-        -c container-test-$PACKIT_SOURCE_BRANCH-$PACKIT_TARGET_BRANCH run
+        -c container-test-${PACKIT_SOURCE_BRANCH,,?}-${PACKIT_TARGET_BRANCH,,?} run
 
diff --git a/plans/main.fmf b/plans/main.fmf
index f03c847c1..e9edf3878 100644
--- a/plans/main.fmf
+++ b/plans/main.fmf
@@ -27,7 +27,7 @@ prepare:
       how: shell
       script: |
         $TMT_PLANS_DATA/ci-dnf-stack/container-test \
-        -c container-test-$PACKIT_SOURCE_BRANCH-$PACKIT_TARGET_BRANCH build \
+        -c container-test-${PACKIT_SOURCE_BRANCH,,?}-${PACKIT_TARGET_BRANCH,,?} build \
         --base $( echo "$@distro" | tr '-' ':') \
         --container-arg="--env=COPR=$PACKIT_COPR_PROJECT" \
         --container-arg="--env=COPR_RPMS=$PACKIT_COPR_RPMS"