diff --git a/.changelog/19994.txt b/.changelog/19994.txt
new file mode 100644
index 00000000000..8aa3871bb24
--- /dev/null
+++ b/.changelog/19994.txt
@@ -0,0 +1,3 @@
+```release-note:bug
+resource/aws_mwaa_environment: Changes to the `kms_key` argument force resource recreation
+```
\ No newline at end of file
diff --git a/aws/resource_aws_mwaa_environment.go b/aws/resource_aws_mwaa_environment.go
index d913ee01be9..276bc090a09 100644
--- a/aws/resource_aws_mwaa_environment.go
+++ b/aws/resource_aws_mwaa_environment.go
@@ -61,6 +61,7 @@ func resourceAwsMwaaEnvironment() *schema.Resource {
 				Type:         schema.TypeString,
 				Optional:     true,
 				ValidateFunc: validateArn,
+				ForceNew:     true,
 			},
 			"last_updated": {
 				Type:     schema.TypeList,