diff --git a/oscar/templates/oscar-additional-cm.yaml b/oscar/templates/oscar-additional-cm.yaml
index 34a8542..e606a50 100644
--- a/oscar/templates/oscar-additional-cm.yaml
+++ b/oscar/templates/oscar-additional-cm.yaml
@@ -1,4 +1,4 @@
-{{- if ne .Values.additionalConfig.allowedImagePrefix "" }}
+{{- if .Values.additionalConfig.allowedImagePrefix }}
 apiVersion: v1
 kind: ConfigMap
 metadata:
@@ -7,7 +7,7 @@ metadata:
 data:
   config.yaml: |
     images:
-      allowed_prefixes: |-
+      allowed_prefixes:
         {{- range .Values.additionalConfig.allowedImagePrefix }}
         - {{ . | title | quote}}
         {{- end }}
diff --git a/oscar/values.yaml b/oscar/values.yaml
index 996cf84..82f6c2f 100644
--- a/oscar/values.yaml
+++ b/oscar/values.yaml
@@ -33,7 +33,7 @@ service:
 
 # Additional OSCAR configuration
 additionalConfig:
-  allowedImagePrefix: ""
+  allowedImagePrefix: []
   
 # Number of replicas to deploy
 replicas: 1