diff --git a/Configurations.md b/Configurations.md
index ff83f02f87ba..06db897a42e7 100644
--- a/Configurations.md
+++ b/Configurations.md
@@ -1626,7 +1626,7 @@ 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)
+- **Stable**: Yes
 
 #### `false` (default):
 
diff --git a/src/config/mod.rs b/src/config/mod.rs
index c6cee8ed2273..398a1814d8d1 100644
--- a/src/config/mod.rs
+++ b/src/config/mod.rs
@@ -127,7 +127,7 @@ 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";