diff --git a/crates/typst-library/src/math/fragment.rs b/crates/typst-library/src/math/fragment.rs
index 8baea9132..8e0510746 100644
--- a/crates/typst-library/src/math/fragment.rs
+++ b/crates/typst-library/src/math/fragment.rs
@@ -216,7 +216,7 @@ impl GlyphFragment {
     pub fn with_id(ctx: &MathContext, c: char, id: GlyphId, span: Span) -> Self {
         let class = match c {
             ':' => Some(MathClass::Relation),
-            '⋯' | '⋱' | '⋰' | '⋮' => Some(MathClass::Normal),
+            '.' | '/' | '⋯' | '⋱' | '⋰' | '⋮' => Some(MathClass::Normal),
             _ => unicode_math_class::class(c),
         };
         let mut fragment = Self {
diff --git a/tests/ref/math/class.png b/tests/ref/math/class.png
index f339c4f1c..7365dc3e1 100644
Binary files a/tests/ref/math/class.png and b/tests/ref/math/class.png differ
diff --git a/tests/typ/math/class.typ b/tests/typ/math/class.typ
index 188e7d90a..0c9fa32b4 100644
--- a/tests/typ/math/class.typ
+++ b/tests/typ/math/class.typ
@@ -31,3 +31,7 @@ $ a dotsq b \
 #let normal = math.class.with("normal")
 #let pluseq = $class("binary", normal(+) normal(=))$
 $ a pluseq 5 $
+
+---
+// Test exceptions.
+$ sqrt(3)\/2 quad d_0.d_1d_2 dots $
\ No newline at end of file
diff --git a/tests/typ/math/matrix-alignment.typ b/tests/typ/math/matrix-alignment.typ
index fd149dd88..0b3aa4564 100644
--- a/tests/typ/math/matrix-alignment.typ
+++ b/tests/typ/math/matrix-alignment.typ
@@ -42,10 +42,13 @@ $ mat(
 
 ---
 // Test #460 equations.
+#let stop = {
+  math.class("punctuation",$.$)
+}
 $ mat(&a+b,c;&d, e) $
 $ mat(&a+b&,c;&d&, e) $
 $ mat(&&&a+b,c;&&&d, e) $
-$ mat(.&a+b&.,c;.....&d&....., e) $
+$ mat(stop &a+b&stop,c;...stop stop&d&...stop stop, e) $
 
 ---
 // Test #454 equations.