diff --git a/internal/warpc/katex.go b/internal/warpc/katex.go
index 2412467a98d..4364dd9ccce 100644
--- a/internal/warpc/katex.go
+++ b/internal/warpc/katex.go
@@ -37,6 +37,10 @@ type KatexOptions struct {
 
 	// Specifies a minimum thickness, in ems, for fraction lines.
 	MinRuleThickness float64 `json:"minRuleThickness"`
+
+	// If true, KaTeX will throw a ParseError when it encounters an unsupported command.
+	// For internal use only, for now.
+	ThrowOnError bool `json:"throwOnError"`
 }
 
 type KatexOutput struct {
diff --git a/tpl/transform/transform.go b/tpl/transform/transform.go
index bcec9346bba..293d01a00c2 100644
--- a/tpl/transform/transform.go
+++ b/tpl/transform/transform.go
@@ -223,6 +223,9 @@ func (ns *Namespace) ToMath(ctx context.Context, args ...any) (template.HTML, er
 		}
 	}
 
+	// Make sure this isn't set by the client (for now).
+	katexInput.Options.ThrowOnError = false
+
 	s := hashing.HashString(args...)
 	key := "tomath/" + s[:2] + "/" + s[2:]
 	fileCache := ns.deps.ResourceSpec.FileCaches.MiscCache()