diff --git a/scripts/download-katex-assets.sh b/scripts/download-katex-assets.sh
index 9c555b6b..e5156710 100755
--- a/scripts/download-katex-assets.sh
+++ b/scripts/download-katex-assets.sh
@@ -3,7 +3,7 @@
 # Download the KaTeX fonts and CSS, and copy them into `static`.
 set -e
 
-root=$(git rev-parse --show-toplevel)
+root=$(dirname "$0")/..
 
 # Check that the caller supplied a version.
 version=$1