diff --git a/src/comment.rs b/src/comment.rs
index 518f2bcda0c..7a0183f59af 100644
--- a/src/comment.rs
+++ b/src/comment.rs
@@ -91,8 +91,9 @@ impl<'a> CommentStyle<'a> {
             | CommentStyle::TripleSlash
             | CommentStyle::Custom(..)
             | CommentStyle::Doc => "",
-            CommentStyle::DoubleBullet => " **/",
-            CommentStyle::SingleBullet | CommentStyle::Exclamation => " */",
+            CommentStyle::SingleBullet | CommentStyle::DoubleBullet | CommentStyle::Exclamation => {
+                " */"
+            }
         }
     }
 
@@ -101,8 +102,9 @@ impl<'a> CommentStyle<'a> {
             CommentStyle::DoubleSlash => "// ",
             CommentStyle::TripleSlash => "/// ",
             CommentStyle::Doc => "//! ",
-            CommentStyle::SingleBullet | CommentStyle::Exclamation => " * ",
-            CommentStyle::DoubleBullet => " ** ",
+            CommentStyle::SingleBullet | CommentStyle::DoubleBullet | CommentStyle::Exclamation => {
+                " * "
+            }
             CommentStyle::Custom(opener) => opener,
         }
     }
diff --git a/tests/target/issue-4020.rs b/tests/target/issue-4020.rs
new file mode 100644
index 00000000000..f29ecec028b
--- /dev/null
+++ b/tests/target/issue-4020.rs
@@ -0,0 +1,9 @@
+// rustfmt-wrap_comments: true
+
+/** foobar */
+const foo1: u32 = 0;
+
+/**
+ * foobar
+ */
+const foo2: u32 = 0;