diff --git a/pika-build-config/lto.sh b/pika-build-config/lto.sh
index 8b9207f18..48468de78 100644
--- a/pika-build-config/lto.sh
+++ b/pika-build-config/lto.sh
@@ -1,5 +1,5 @@
-export PIKA_PACKAGE_VERSION="1:2.0.1+dfsg1-1"
-export PIKA_PACKAGE_NAME="libtk-img"
+export PIKA_PACKAGE_VERSION="8.6.16+dfsg-1"
+export PIKA_PACKAGE_NAME="tcl8.6"
 export PIKA_PACKAGE_PATCH=false
 export PIKA_REBUILD=false
 export PIKA_REBUILD_VERSION="b0"