diff --git a/pika-build-config/lto.sh b/pika-build-config/lto.sh
index 406884fa1..26fd1982c 100644
--- a/pika-build-config/lto.sh
+++ b/pika-build-config/lto.sh
@@ -1,5 +1,5 @@
-export PIKA_PACKAGE_VERSION="8.5.15+dfsg-1"
-export PIKA_PACKAGE_NAME="libfastutil-java"
+export PIKA_PACKAGE_VERSION="0.7.3-1"
+export PIKA_PACKAGE_NAME="haskell-unix-compat"
 export PIKA_PACKAGE_PATCH=false
 export PIKA_REBUILD=false
 export PIKA_REBUILD_VERSION="b0"