diff --git a/pika-build-config/lto.sh b/pika-build-config/lto.sh
index b774302ce..e9d19f788 100644
--- a/pika-build-config/lto.sh
+++ b/pika-build-config/lto.sh
@@ -1,5 +1,5 @@
-export PIKA_PACKAGE_VERSION="0.6.2-6"
-export PIKA_PACKAGE_NAME="haskell-control-monad-free"
+export PIKA_PACKAGE_VERSION="0.5.0.2-3"
+export PIKA_PACKAGE_NAME="haskell-sop-core"
 export PIKA_PACKAGE_PATCH=false
 export PIKA_REBUILD=false
 export PIKA_REBUILD_VERSION="b0"