diff --git a/pika-build-config/lto.sh b/pika-build-config/lto.sh
index cf1f2d7b4..eda8a1c6c 100644
--- a/pika-build-config/lto.sh
+++ b/pika-build-config/lto.sh
@@ -1,5 +1,5 @@
-export PIKA_PACKAGE_VERSION="1.5.1-4"
-export PIKA_PACKAGE_NAME="haskell-what4"
+export PIKA_PACKAGE_VERSION="0.12.8.7-1"
+export PIKA_PACKAGE_NAME="haskell-texmath"
 export PIKA_PACKAGE_PATCH=false
 export PIKA_REBUILD=false
 export PIKA_REBUILD_VERSION="b0"