diff --git a/pika-build-config/lto.sh b/pika-build-config/lto.sh
index c107ceb2d..fb3867370 100644
--- a/pika-build-config/lto.sh
+++ b/pika-build-config/lto.sh
@@ -1,5 +1,5 @@
-export PIKA_PACKAGE_VERSION="3.4.0-11"
-export PIKA_PACKAGE_NAME="libnet-tclink-perl"
+export PIKA_PACKAGE_VERSION="1.13.1-1"
+export PIKA_PACKAGE_NAME="sympy"
 export PIKA_PACKAGE_PATCH=false
 export PIKA_REBUILD=false
 export PIKA_REBUILD_VERSION="b0"