diff --git a/.github/workflows/migrate-s3.yaml b/.github/workflows/migrate-s3.yaml
index 28bed3b..2cf3a61 100644
--- a/.github/workflows/migrate-s3.yaml
+++ b/.github/workflows/migrate-s3.yaml
@@ -65,13 +65,13 @@ jobs:
 
           prefixes=$(kubectl exec $SERVICE_POD_NAME -- aws s3api list-objects-v2 --bucket $SRC_BUCKET --delimiter '/' --query 'CommonPrefixes[*].Prefix' --output text)
           # remove all spaces and put one comma between prefixes
-          cleaned_prefixes=$(echo $prefixes | tr ' ' ',')
+          cleaned_prefixes=$(echo $prefixes | tr -s '[:space:]' ',')
           DIRS=""
           IFS=','
           for prefix in $cleaned_prefixes; do
               DIR=$(kubectl exec $SERVICE_POD_NAME -- aws s3api list-objects-v2 --bucket $SRC_BUCKET --prefix "$prefix" --delimiter '/' --query 'CommonPrefixes[*].Prefix' --output text)
               if [ -n "$DIR" ]; then
-                  DIR=$(echo $DIR | tr ' ' ',')
+                  DIR=$(echo $DIR | tr -s '[:space:]' ',')
                   DIRS="${DIRS}${DIR},"
               fi
           done