diff --git a/.changelog/6841.txt b/.changelog/6841.txt
new file mode 100644
index 0000000000..b743f92073
--- /dev/null
+++ b/.changelog/6841.txt
@@ -0,0 +1,3 @@
+```release-note:bug
+compute: fixed a failure in updating `most_disruptive_allowed_action` on `google_compute_per_instance_config` and `google_compute_region_per_instance_config`
+```
diff --git a/google/resource_compute_per_instance_config.go b/google/resource_compute_per_instance_config.go
index 94a72c4fa6..06d253427b 100644
--- a/google/resource_compute_per_instance_config.go
+++ b/google/resource_compute_per_instance_config.go
@@ -400,7 +400,7 @@ func resourceComputePerInstanceConfigUpdate(d *schema.ResourceData, meta interfa
 	if isEmptyValue(reflect.ValueOf(mostDisruptiveAction)) {
 		mostDisruptiveAction = "REPLACE"
 	}
-	obj["mostDisruptiveActionAllowed"] = mostDisruptiveAction
+	obj["mostDisruptiveAllowedAction"] = mostDisruptiveAction
 
 	url, err = replaceVars(d, config, "{{ComputeBasePath}}projects/{{project}}/zones/{{zone}}/instanceGroupManagers/{{instance_group_manager}}/applyUpdatesToInstances")
 	if err != nil {
diff --git a/google/resource_compute_region_per_instance_config.go b/google/resource_compute_region_per_instance_config.go
index 10f229dc39..daa95938ef 100644
--- a/google/resource_compute_region_per_instance_config.go
+++ b/google/resource_compute_region_per_instance_config.go
@@ -409,7 +409,7 @@ func resourceComputeRegionPerInstanceConfigUpdate(d *schema.ResourceData, meta i
 	if isEmptyValue(reflect.ValueOf(mostDisruptiveAction)) {
 		mostDisruptiveAction = "REPLACE"
 	}
-	obj["mostDisruptiveActionAllowed"] = mostDisruptiveAction
+	obj["mostDisruptiveAllowedAction"] = mostDisruptiveAction
 
 	url, err = replaceVars(d, config, "{{ComputeBasePath}}projects/{{project}}/regions/{{region}}/instanceGroupManagers/{{region_instance_group_manager}}/applyUpdatesToInstances")
 	if err != nil {