diff --git a/pkg/apis/messaging/v1/in_memory_channel_validation.go b/pkg/apis/messaging/v1/in_memory_channel_validation.go
index 5f7e5f42d76..b6c701c8a97 100644
--- a/pkg/apis/messaging/v1/in_memory_channel_validation.go
+++ b/pkg/apis/messaging/v1/in_memory_channel_validation.go
@@ -22,11 +22,16 @@ import (
 
 	"knative.dev/pkg/apis"
 	"knative.dev/pkg/kmp"
+	"knative.dev/pkg/system"
 
 	"knative.dev/eventing/pkg/apis/eventing"
 )
 
-const eventingControllerSAName = "system:serviceaccount:knative-eventing:eventing-controller"
+var eventingControllerSAName string
+
+func init() {
+	eventingControllerSAName = fmt.Sprintf("system:serviceaccount:%s:eventing-controller", system.Namespace())
+}
 
 func (imc *InMemoryChannel) Validate(ctx context.Context) *apis.FieldError {
 	errs := imc.Spec.Validate(ctx).ViaField("spec")