diff --git a/crates/typst-library/src/math/ctx.rs b/crates/typst-library/src/math/ctx.rs
index acd60e48..2ebd55b9 100644
--- a/crates/typst-library/src/math/ctx.rs
+++ b/crates/typst-library/src/math/ctx.rs
@@ -258,7 +258,9 @@ impl<'a, 'b, 'v> MathContext<'a, 'b, 'v> {
         self.local.set(TextElem::set_weight(if style.bold {
             FontWeight::BOLD
         } else {
-            FontWeight::REGULAR
+            // The normal weight is what we started with.
+            // It's 400 for CM Regular, 450 for CM Book.
+            self.font.info().variant.weight
         }));
         self.style = style;
     }
diff --git a/crates/typst/src/font/mod.rs b/crates/typst/src/font/mod.rs
index 2353e51c..888960f1 100644
--- a/crates/typst/src/font/mod.rs
+++ b/crates/typst/src/font/mod.rs
@@ -134,7 +134,7 @@ impl Hash for Font {
 
 impl Debug for Font {
     fn fmt(&self, f: &mut Formatter) -> fmt::Result {
-        write!(f, "Font({})", self.info().family)
+        write!(f, "Font({},{:?})", self.info().family, self.info().variant)
     }
 }
 
diff --git a/tests/ref/math/accent.png b/tests/ref/math/accent.png
index 78d5f498..e3ad7f4d 100644
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diff --git a/tests/ref/math/attach-p3.png b/tests/ref/math/attach-p3.png
index 104534b7..03c5da09 100644
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diff --git a/tests/ref/math/cases.png b/tests/ref/math/cases.png
index b9e54e75..d54246cd 100644
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diff --git a/tests/ref/math/content.png b/tests/ref/math/content.png
index 4fbd4670..e7ec48fe 100644
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diff --git a/tests/ref/math/frac.png b/tests/ref/math/frac.png
index 0b81e37b..59357cff 100644
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diff --git a/tests/ref/math/matrix-alignment.png b/tests/ref/math/matrix-alignment.png
index c3059cfd..546f8757 100644
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diff --git a/tests/ref/math/multiline.png b/tests/ref/math/multiline.png
index bfa85b7b..e0b13f15 100644
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diff --git a/tests/ref/math/spacing.png b/tests/ref/math/spacing.png
index 10adc724..31768239 100644
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diff --git a/tests/ref/math/style.png b/tests/ref/math/style.png
index 27f0a27d..d2e6776a 100644
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diff --git a/tests/ref/math/syntax.png b/tests/ref/math/syntax.png
index d828a478..c156353c 100644
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diff --git a/tests/ref/math/underover.png b/tests/ref/math/underover.png
index 62dcfefc..c3bb47f9 100644
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