diff --git a/pika-build-config/lto.sh b/pika-build-config/lto.sh
index f90a146b8..c042463b8 100644
--- a/pika-build-config/lto.sh
+++ b/pika-build-config/lto.sh
@@ -1,5 +1,5 @@
-export PIKA_PACKAGE_VERSION="0.9.5-1"
-export PIKA_PACKAGE_NAME="rust-memmap2"
+export PIKA_PACKAGE_VERSION="0.603-6"
+export PIKA_PACKAGE_NAME="proalign"
 export PIKA_PACKAGE_PATCH=false
 export PIKA_REBUILD=false
 export PIKA_REBUILD_VERSION="b0"