diff --git a/koku/masu/util/aws/common.py b/koku/masu/util/aws/common.py
index 8394a4da12..0dc95642ab 100644
--- a/koku/masu/util/aws/common.py
+++ b/koku/masu/util/aws/common.py
@@ -901,9 +901,9 @@ def match_openshift_resources_and_labels(data_frame, cluster_topologies, matched
     data_frame["special_case_tag_matched"] = False
     tags = data_frame["resourcetags"]
     if not tags.eq("").all():
-        tags = tags.str.lower()
+        tags_lower = tags.str.lower()
         LOG.info("Matching OpenShift on AWS by tags.")
-        special_case_tag_matched = tags.str.contains(
+        special_case_tag_matched = tags_lower.str.contains(
             "|".join(["openshift_cluster", "openshift_project", "openshift_node"])
         )
         data_frame["special_case_tag_matched"] = special_case_tag_matched
diff --git a/koku/masu/util/azure/common.py b/koku/masu/util/azure/common.py
index c2f291660b..afb2671200 100644
--- a/koku/masu/util/azure/common.py
+++ b/koku/masu/util/azure/common.py
@@ -171,9 +171,9 @@ def match_openshift_resources_and_labels(data_frame, cluster_topologies, matched
     data_frame["special_case_tag_matched"] = False
     tags = data_frame["tags"]
     if not tags.eq("").all():
-        tags = tags.str.lower()
+        tags_lower = tags.str.lower()
         LOG.info("Matching OpenShift on Azure by tags.")
-        special_case_tag_matched = tags.str.contains(
+        special_case_tag_matched = tags_lower.str.contains(
             "|".join(["openshift_cluster", "openshift_project", "openshift_node"])
         )
         data_frame["special_case_tag_matched"] = special_case_tag_matched