diff --git a/backend/builder/image_builder/image_builder.py b/backend/builder/image_builder/image_builder.py
index acc2c258e..7b0762950 100644
--- a/backend/builder/image_builder/image_builder.py
+++ b/backend/builder/image_builder/image_builder.py
@@ -304,8 +304,8 @@ def _build_container(dockerfile_mount_path: str, image_tag: str) -> kubernetes.c
     return kubernetes.client.V1Container(
         name=KANIKO_CONTAINER_NAME,
         image="busybox",
-        command="sleep 100000",
-        args=args,
+        command=["sleep", "100000"],
+        args=None,
         volume_mounts=volume_mounts,
         security_context=container_security_context,
     )
diff --git a/charts/substra-backend/templates/statefulset-builder.yaml b/charts/substra-backend/templates/statefulset-builder.yaml
index 151d2a616..ecc0f6249 100644
--- a/charts/substra-backend/templates/statefulset-builder.yaml
+++ b/charts/substra-backend/templates/statefulset-builder.yaml
@@ -150,7 +150,7 @@ spec:
           - name: PRIVATE_CA_CONFIGMAP_NAME
             value: {{ .Values.privateCa.configMap.name }}
           - name: PRIVATE_CA_FILENAME
-            value: {{ .Values.privateCa.configMap.filename }}
+            value: {{ .Values.privateCa.configMap.fileName }}
           {{- end }}
           - name: NAMESPACE
             valueFrom:
diff --git a/charts/substra-backend/values.yaml b/charts/substra-backend/values.yaml
index fda3d4914..edf639a9e 100644
--- a/charts/substra-backend/values.yaml
+++ b/charts/substra-backend/values.yaml
@@ -15,7 +15,7 @@ DataSampleStorageInServerMedia: false
 privateCa:
   ## @param privateCa.enabled Run the init container injecting the private CA certificate
   ##
-  enabled: true
+  enabled: false
   ## @param privateCa.image.repository Private CA injector image
   ## @param privateCa.image.tag Private CA injector tag
   ## @param privateCa.image.pullPolicy Private CA injector pull policy
@@ -37,7 +37,6 @@ privateCa:
   configMap:
     name: substra-private-ca
     data:
-      blabla
     fileName: private-ca.crt
 
 ## @section Server settings