diff --git a/Configurations.md b/Configurations.md
index 6ba78e714e0..38fbd07ec97 100644
--- a/Configurations.md
+++ b/Configurations.md
@@ -1514,7 +1514,7 @@ Put a trailing comma after a block based match arm (non-block arms are not affec
 
 - **Default value**: `false`
 - **Possible values**: `true`, `false`
-- **Stable**: No (tracking issue: [#3380](https://github.com/rust-lang/rustfmt/issues/3380))
+- **Stable**: Yes
 
 #### `false` (default):
 
diff --git a/rustfmt-core/rustfmt-lib/src/config.rs b/rustfmt-core/rustfmt-lib/src/config.rs
index 6b1c73ee4c1..23f6ae533ae 100644
--- a/rustfmt-core/rustfmt-lib/src/config.rs
+++ b/rustfmt-core/rustfmt-lib/src/config.rs
@@ -117,7 +117,7 @@ create_config! {
         "Add trailing semicolon after break, continue and return";
     trailing_comma: SeparatorTactic, SeparatorTactic::Vertical, false,
         "How to handle trailing commas for lists";
-    match_block_trailing_comma: bool, false, false,
+    match_block_trailing_comma: bool, false, true,
         "Put a trailing comma after a block based match arm (non-block arms are not affected)";
     blank_lines_upper_bound: usize, 1, false,
         "Maximum number of blank lines which can be put between items";