diff --git a/crates/typst-syntax/src/lexer.rs b/crates/typst-syntax/src/lexer.rs
index 92e78b2d0..721225c6e 100644
--- a/crates/typst-syntax/src/lexer.rs
+++ b/crates/typst-syntax/src/lexer.rs
@@ -503,7 +503,10 @@ impl Lexer<'_> {
     }
 
     fn space_or_end(&self) -> bool {
-        self.s.done() || self.s.at(char::is_whitespace)
+        self.s.done()
+            || self.s.at(char::is_whitespace)
+            || self.s.at("//")
+            || self.s.at("/*")
     }
 }
 
diff --git a/tests/suite/syntax/comment.typ b/tests/suite/syntax/comment.typ
index 5e7e0ee69..88802fe97 100644
--- a/tests/suite/syntax/comment.typ
+++ b/tests/suite/syntax/comment.typ
@@ -34,6 +34,41 @@ Second part
 First part          //
 Second part
 
+--- issue-4632-sth-followed-by-comment ---
+// Test heading markers followed by comments.
+#test([
+  =// Comment
+  =/* Comment */
+], [
+  =
+  =
+])
+
+// Test list markers followed by comments.
+#test([
+  -// Comment
+  -/* Comment */
+], [
+  -
+  -
+])
+
+// Test enum markers followed by comments.
+#test([
+  +// Comment
+  +/* Comment */
+
+  1.// Comment
+  2./* Comment */
+], [
+  +
+  +
+
+  1.
+  2.
+])
+
+
 --- comment-block-unclosed ---
 // End should not appear without start.
 // Error: 7-9 unexpected end of block comment