diff --git a/helm/porthole/values.yaml b/helm/porthole/values.yaml
index 57126b0..ad42620 100644
--- a/helm/porthole/values.yaml
+++ b/helm/porthole/values.yaml
@@ -17,9 +17,11 @@ scheduling:
   compute:
     affinity:
       nodeAffinity:
-        requiredDuringSchedulingIgnoredDuringExecution:
-          nodeSelectorTerms:
-            - matchExpressions:
+        # Prefer compute nodes when they exist, but don't require them.
+        preferredDuringSchedulingIgnoredDuringExecution:
+          - weight: 100
+            preference:
+              matchExpressions:
                 - key: node-class
                   operator: In
                   values: