diff --git a/crates/typst/src/model/bibliography.rs b/crates/typst/src/model/bibliography.rs
index ed593d45c..71616616c 100644
--- a/crates/typst/src/model/bibliography.rs
+++ b/crates/typst/src/model/bibliography.rs
@@ -217,7 +217,7 @@ impl Show for Packed<BibliographyElem> {
         }) {
             seq.push(
                 HeadingElem::new(title)
-                    .with_level(Smart::Custom(NonZeroUsize::ONE))
+                    .with_depth(NonZeroUsize::ONE)
                     .pack()
                     .spanned(self.span()),
             );
diff --git a/tests/ref/issue-4618-bibliography-set-heading-level.png b/tests/ref/issue-4618-bibliography-set-heading-level.png
new file mode 100644
index 000000000..29a4e5174
Binary files /dev/null and b/tests/ref/issue-4618-bibliography-set-heading-level.png differ
diff --git a/tests/suite/model/bibliography.typ b/tests/suite/model/bibliography.typ
index 7197082fb..18c626200 100644
--- a/tests/suite/model/bibliography.typ
+++ b/tests/suite/model/bibliography.typ
@@ -53,3 +53,16 @@ Now we have multiple bibliographies containing @glacier-melt @keshav2007read
 
 @Zee04
 #bibliography("/assets/bib/works_too.bib", style: "mla")
+
+--- issue-4618-bibliography-set-heading-level ---
+// Test that the bibliography block's heading is set to 2 by the show rule,
+// and therefore should be rendered like a level-2 heading. Notably, this
+// bibliography heading should not be underlined.
+#show heading.where(level: 1): it => [ #underline(it.body) ]
+#show bibliography: set heading(level: 2)
+
+= Level 1
+== Level 2
+@Zee04
+
+#bibliography("/assets/bib/works_too.bib")