diff --git a/config/clusters/projectpythia-binder/binderhub.values.yaml b/config/clusters/projectpythia-binder/binderhub.values.yaml
index 23bc527b6e..bc60ea0149 100644
--- a/config/clusters/projectpythia-binder/binderhub.values.yaml
+++ b/config/clusters/projectpythia-binder/binderhub.values.yaml
@@ -122,6 +122,30 @@ binderhub-service:
     nodeSelector:
       hub.jupyter.org/node-purpose:
       capi.stackhpc.com/node-group: user-m3-large
+  extraConfig:
+    patch-build-spec.py: |
+      from binderhub.build import KubernetesBuildExecutor
+      from kubernetes import client
+
+      class LimitedBuildExecutor(KubernetesBuildExecutor):
+
+          def pre_process_pod(self, pod):
+            container, = pod.spec.containers
+            container.resources.requests['ephemeral-storage'] = "9Gi"
+            print("Patching build pod definition to set ephemeral-storage request:\n", pod)
+            return pod
+
+          @property
+          def pod(self):
+              # No custom error handling, this is internal
+              return self._pod
+
+          @pod.setter
+          def pod(self, value):
+              self._pod = self.pre_process_pod(value)
+
+          c.BinderHub.build_class = LimitedBuildExecutor
+
   config:
     GitHubRepoProvider:
       allowed_specs: