diff --git a/.changelog/32698.txt b/.changelog/32698.txt
new file mode 100644
index 00000000000..f835f940453
--- /dev/null
+++ b/.changelog/32698.txt
@@ -0,0 +1,3 @@
+```release-note:bug
+resource/aws_dms_s3_endpoint: Don't send the default value of `false` for `add_trailing_padding_character` to maintain compatibility with older ((pre-3.4.7)[https://docs.aws.amazon.com/dms/latest/userguide/CHAP_ReleaseNotes.html#CHAP_ReleaseNotes.DMS347]) DMS engine versions
+```
diff --git a/internal/service/dms/s3_endpoint.go b/internal/service/dms/s3_endpoint.go
index 2825473d891..13aedc90725 100644
--- a/internal/service/dms/s3_endpoint.go
+++ b/internal/service/dms/s3_endpoint.go
@@ -576,8 +576,8 @@ func s3Settings(d *schema.ResourceData, target bool) *dms.S3Settings {
 		s3s.AddColumnName = aws.Bool(v)
 	}
 
-	if v, ok := d.Get("add_trailing_padding_character").(bool); ok && target { // target
-		s3s.AddTrailingPaddingCharacter = aws.Bool(v)
+	if v, ok := d.GetOk("add_trailing_padding_character"); ok && target { // target
+		s3s.AddTrailingPaddingCharacter = aws.Bool(v.(bool))
 	}
 
 	if v, ok := d.GetOk("bucket_folder"); ok {