diff --git a/Configurations.md b/Configurations.md
index 6ba78e714e0..8e377cee21d 100644
--- a/Configurations.md
+++ b/Configurations.md
@@ -47,7 +47,7 @@ Where to put a binary operator when a binary expression goes multiline.
 
 - **Default value**: `"Front"`
 - **Possible values**: `"Front"`, `"Back"`
-- **Stable**: No (tracking issue: [#3368](https://github.com/rust-lang/rustfmt/issues/3368))
+- **Stable**: Yes
 
 #### `"Front"` (default):
 
diff --git a/rustfmt-core/rustfmt-lib/src/config.rs b/rustfmt-core/rustfmt-lib/src/config.rs
index 6b1c73ee4c1..68bb79e282b 100644
--- a/rustfmt-core/rustfmt-lib/src/config.rs
+++ b/rustfmt-core/rustfmt-lib/src/config.rs
@@ -92,7 +92,7 @@ create_config! {
     space_around_attr_eq: bool, true, false,
         "Determines if '=' are wrapped in spaces in attributes.";
     spaces_around_ranges: bool, false, false, "Put spaces around the  .. and ..= range operators";
-    binop_separator: SeparatorPlace, SeparatorPlace::Front, false,
+    binop_separator: SeparatorPlace, SeparatorPlace::Front, true,
         "Where to put a binary operator when a binary expression goes multiline";
 
     // Misc.