diff --git a/.changeset/fluffy-brooms-dream.md b/.changeset/fluffy-brooms-dream.md
new file mode 100644
index 00000000000..9693260837b
--- /dev/null
+++ b/.changeset/fluffy-brooms-dream.md
@@ -0,0 +1,5 @@
+---
+"@primer/react": patch
+---
+
+Fix `line-height` on markdown viewer (comment box)
diff --git a/src/drafts/MarkdownEditor/_MarkdownInput.tsx b/src/drafts/MarkdownEditor/_MarkdownInput.tsx
index e22a0858590..a9e030e0fa4 100644
--- a/src/drafts/MarkdownEditor/_MarkdownInput.tsx
+++ b/src/drafts/MarkdownEditor/_MarkdownInput.tsx
@@ -164,7 +164,7 @@ export const MarkdownInput = forwardRef<HTMLTextAreaElement, MarkdownInputProps>
               boxShadow: 'none',
             },
             '& textarea': {
-              lineHeight: 1.2,
+              lineHeight: 'var(--text-body-lineHeight-medium, 1.4285)',
               resize: fullHeight ? 'none' : 'vertical',
               p: 3,
               fontFamily: monospace ? 'mono' : 'normal',