diff --git a/charts/opencloud/templates/_helpers/tpl.yaml b/charts/opencloud/templates/_helpers/tpl.yaml
index 83b9b613..ffe388f9 100644
--- a/charts/opencloud/templates/_helpers/tpl.yaml
+++ b/charts/opencloud/templates/_helpers/tpl.yaml
@@ -184,3 +184,13 @@ Return the appropriate apiVersion for ingress
 {{- print "networking.k8s.io/v1beta1" -}}
 {{- end -}}
 {{- end -}}
+
+{{/*
+Validate office suite configuration
+Ensures that only one of Collabora or OnlyOffice can be enabled at the same time
+*/}}
+{{- define "opencloud.validateOfficeSuite" -}}
+{{- if and .Values.collabora.enabled .Values.onlyoffice.enabled }}
+  {{- fail "Error: Only one of Collabora or OnlyOffice can be enabled at the same time! Both services use the same WOPI endpoints and cannot coexist. Please set either collabora.enabled=false or onlyoffice.enabled=false" }}
+{{- end }}
+{{- end -}}
diff --git a/charts/opencloud/templates/opencloud/deployment.yaml b/charts/opencloud/templates/opencloud/deployment.yaml
index 1cafc17a..8f316a28 100644
--- a/charts/opencloud/templates/opencloud/deployment.yaml
+++ b/charts/opencloud/templates/opencloud/deployment.yaml
@@ -1,4 +1,5 @@
 {{- if .Values.opencloud.enabled }}
+{{- include "opencloud.validateOfficeSuite" . }}
 apiVersion: apps/v1
 kind: Deployment
 metadata: