diff --git a/pipelines/template-build/template-build.yaml b/pipelines/template-build/template-build.yaml
index ab3fdcf58c..8b6a84652e 100644
--- a/pipelines/template-build/template-build.yaml
+++ b/pipelines/template-build/template-build.yaml
@@ -87,9 +87,8 @@ spec:
           workspace: git-auth
     - name: prefetch-dependencies
       when:
-      - input: $(params.hermetic)
-        operator: in
-        values: ["true"]
+      - cel: >-
+        '$(params.prefetch-input) != '' || '$(params.hermetic)' == 'true'
       params:
         - name: input
           value: $(params.prefetch-input)