diff --git a/pika-build-config/lto.sh b/pika-build-config/lto.sh
index b9dab3679..76eeb81aa 100644
--- a/pika-build-config/lto.sh
+++ b/pika-build-config/lto.sh
@@ -1,5 +1,5 @@
-export PIKA_PACKAGE_VERSION="3.21.6+dfsg1-3"
-export PIKA_PACKAGE_NAME="petsc"
+export PIKA_PACKAGE_VERSION="1.7-5"
+export PIKA_PACKAGE_NAME="mffm-fftw"
 export PIKA_PACKAGE_PATCH=false
 export PIKA_REBUILD=false
 export PIKA_REBUILD_VERSION="b0"