diff --git a/src/dials/algorithms/scaling/SConscript b/src/dials/algorithms/scaling/SConscript
index 4d82cfa71a..1ba5e56b10 100644
--- a/src/dials/algorithms/scaling/SConscript
+++ b/src/dials/algorithms/scaling/SConscript
@@ -5,3 +5,9 @@ env.SharedLibrary(
     source=["boost_python/scaling_helper.cc", "boost_python/scaling_ext.cc"],
     LIBS=env["LIBS"],
 )
+
+env.SharedLibrary(
+    target="#/lib/dials_tof_scaling_ext",
+    source=["tof/boost_python/tof_scaling_ext.cc"],
+    LIBS=env["LIBS"],
+)