diff --git a/modules/artifact-registry/main.tf b/modules/artifact-registry/main.tf
index 1a1476bf..5b23a193 100644
--- a/modules/artifact-registry/main.tf
+++ b/modules/artifact-registry/main.tf
@@ -30,7 +30,12 @@ resource "google_artifact_registry_repository" "registry" {
   kms_key_name  = var.encryption_key
 
   dynamic "docker_config" {
-    for_each = local.format_string == "docker" ? [""] : []
+    # TODO: open a bug on the provider for this permadiff
+    for_each = (
+      local.format_string == "docker" && try(var.format.docker.immutable_tags, null) == true
+      ? [""]
+      : []
+    )
     content {
       immutable_tags = var.format.docker.immutable_tags
     }