diff --git a/models/views/scratch/snowplow_unified_views_this_run.sql b/models/views/scratch/snowplow_unified_views_this_run.sql
index ee0cdeb7..4f32ecd6 100644
--- a/models/views/scratch/snowplow_unified_views_this_run.sql
+++ b/models/views/scratch/snowplow_unified_views_this_run.sql
@@ -94,7 +94,7 @@ with prep as (
 
     left join {{ ref(var('snowplow__ga4_categories_seed')) }} c on 
       {% if var('snowplow__use_refr_if_mkt_null', false) %}
-        lower(trim(coalesce(ev.mkt_source, ev.refr_source)) = lower(c.source)
+        lower(trim(coalesce(ev.mkt_source, ev.refr_source))) = lower(c.source)
       {% else %}
         lower(trim(ev.mkt_source)) = lower(c.source)
       {% endif %}