diff --git a/pika-build-config/lto.sh b/pika-build-config/lto.sh
index 58e6afb0d..030f1299f 100644
--- a/pika-build-config/lto.sh
+++ b/pika-build-config/lto.sh
@@ -1,5 +1,5 @@
-export PIKA_PACKAGE_VERSION="1.8.0-1"
-export PIKA_PACKAGE_NAME="extlib"
+export PIKA_PACKAGE_VERSION="4.3.0-1"
+export PIKA_PACKAGE_NAME="itcl4"
 export PIKA_PACKAGE_PATCH=false
 export PIKA_REBUILD=false
 export PIKA_REBUILD_VERSION="b0"