diff --git a/src/attr.rs b/src/attr.rs
index e17b89e5c9e7..83de61c5e253 100644
--- a/src/attr.rs
+++ b/src/attr.rs
@@ -247,7 +247,8 @@ impl Rewrite for ast::MetaItem {
                     config: context.config,
                 };
                 let item_str = write_list(&item_vec, &fmt)?;
-                let one_line_budget = shape.offset_left(name.len())?.sub_width(2)?.width;
+                // 3 = "()" and "]"
+                let one_line_budget = shape.offset_left(name.len())?.sub_width(3)?.width;
                 if context.config.indent_style() == IndentStyle::Visual
                     || (!item_str.contains('\n') && item_str.len() <= one_line_budget)
                 {
diff --git a/tests/source/attrib.rs b/tests/source/attrib.rs
index 552dd2b94429..d5c244a9bf88 100644
--- a/tests/source/attrib.rs
+++ b/tests/source/attrib.rs
@@ -157,3 +157,7 @@ pub struct HP(pub u8);
 
 // Long `#[doc = "..."]`
 struct A { #[doc = "xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx"] b: i32 }
+
+// #2647
+#[cfg(feature = "this_line_is_101_characters_long_xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx")]
+pub fn foo() {}
diff --git a/tests/target/attrib.rs b/tests/target/attrib.rs
index 13ba8bd64db0..45dc4ea8ba95 100644
--- a/tests/target/attrib.rs
+++ b/tests/target/attrib.rs
@@ -165,3 +165,9 @@ struct A {
     #[doc = "xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx"]
     b: i32,
 }
+
+// #2647
+#[cfg(
+    feature = "this_line_is_101_characters_long_xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx"
+)]
+pub fn foo() {}