diff --git a/pika-build-config/lto.sh b/pika-build-config/lto.sh
index bffb150e5..55ac3ca2c 100644
--- a/pika-build-config/lto.sh
+++ b/pika-build-config/lto.sh
@@ -1,5 +1,5 @@
-export PIKA_PACKAGE_VERSION="0.1.20+really0.1.18-1"
-export PIKA_PACKAGE_NAME="peg"
+export PIKA_PACKAGE_VERSION="0.1.0-2"
+export PIKA_PACKAGE_NAME="rust-unicode-math-class"
 export PIKA_PACKAGE_PATCH=false
 export PIKA_REBUILD=false
 export PIKA_REBUILD_VERSION="b0"