diff --git a/jenkins/scripts/release-tools/functions b/jenkins/scripts/release-tools/functions
index c8c281b6be..fb4d8fe2b1 100644
--- a/jenkins/scripts/release-tools/functions
+++ b/jenkins/scripts/release-tools/functions
@@ -81,7 +81,7 @@ function update_upper_constraints {
 
     echo "Updating tox.ini for upper-constraints"
     git checkout $branch
-    sed -i~ -e "s,-c.*{\(env:UPPER_CONSTRAINTS_FILE\)[^ ]*} ,-c{\1:$uc_url}," tox.ini
+    sed -i~ -e "s,-c.*{\(env:UPPER_CONSTRAINTS_FILE\)[^ ]*},-c{\1:$uc_url}," tox.ini
     if ! git diff --exit-code >/dev/null 2>&1 ; then
         git add tox.ini
         git commit -m "Update UPPER_CONSTRAINTS_FILE for $branch"