diff --git a/crates/markdown/src/markdown.rs b/crates/markdown/src/markdown.rs
index 8ef88901f3c725ad050bf3ae792aa7de8e2a3dc5..998a180e63b2ad5f784d1953ba95e4853e3c3031 100644
--- a/crates/markdown/src/markdown.rs
+++ b/crates/markdown/src/markdown.rs
@@ -223,6 +223,7 @@ impl Markdown {
     }
 
     pub fn escape(s: &str) -> Cow<str> {
+        // Valid to use bytes since multi-byte UTF-8 doesn't use ASCII chars.
         let count = s
             .bytes()
             .filter(|c| *c == b'\n' || c.is_ascii_punctuation())
diff --git a/crates/markdown/src/parser.rs b/crates/markdown/src/parser.rs
index e5e584728942e40267c547bb3d0cf57826affbdc..debfe5245f547a6553789c029eba7edbc6e6cc5a 100644
--- a/crates/markdown/src/parser.rs
+++ b/crates/markdown/src/parser.rs
@@ -79,9 +79,10 @@ pub fn parse_markdown(
                         let content_range =
                             content_range.start + range.start..content_range.end + range.start;
 
+                        // Valid to use bytes since multi-byte UTF-8 doesn't use ASCII chars.
                         let line_count = text[content_range.clone()]
-                            .chars()
-                            .filter(|c| *c == '\n')
+                            .bytes()
+                            .filter(|c| *c == b'\n')
                             .count();
                         let metadata = CodeBlockMetadata {
                             content_range,