diff --git a/src/formatting/lists.rs b/src/formatting/lists.rs
index 6d9aa529f7c..447c40bcd03 100644
--- a/src/formatting/lists.rs
+++ b/src/formatting/lists.rs
@@ -569,7 +569,7 @@ where
                 formatted_comment = rewrite_post_comment(&mut item_max_width)?;
             }
 
-            if !starts_with_newline(comment) {
+            if !starts_with_newline(comment) || !separate {
                 if formatting.align_comments {
                     let mut comment_alignment = post_comment_alignment(
                         item_max_width,
diff --git a/tests/source/issue-4757.rs b/tests/source/issue-4757.rs
new file mode 100644
index 00000000000..c1e88f3fa97
--- /dev/null
+++ b/tests/source/issue-4757.rs
@@ -0,0 +1,30 @@
+fn main() {
+    match 1 {
+        _ => {},
+        // hello!
+    }
+}
+
+fn main() {
+    match 1 {
+        _ => {}
+        // hello!
+    }
+}
+
+fn main() {
+    match 1 {
+        1 => {},
+        // hello
+        _ => {},
+        // world!
+    }
+}
+
+fn main() {
+    match 1 {
+        1 => {}
+        // hello
+        _ => {} // world!
+    }
+}
diff --git a/tests/target/issue-4757.rs b/tests/target/issue-4757.rs
new file mode 100644
index 00000000000..ffa225cfca2
--- /dev/null
+++ b/tests/target/issue-4757.rs
@@ -0,0 +1,27 @@
+fn main() {
+    match 1 {
+        _ => {} // hello!
+    }
+}
+
+fn main() {
+    match 1 {
+        _ => {} // hello!
+    }
+}
+
+fn main() {
+    match 1 {
+        1 => {}
+        // hello
+        _ => {} // world!
+    }
+}
+
+fn main() {
+    match 1 {
+        1 => {}
+        // hello
+        _ => {} // world!
+    }
+}