diff --git a/cpp/ql/lib/qlpack.yml b/cpp/ql/lib/qlpack.yml
index febb297cb8d..5c2083a8613 100644
--- a/cpp/ql/lib/qlpack.yml
+++ b/cpp/ql/lib/qlpack.yml
@@ -21,3 +21,4 @@ dataExtensions:
   - ext/deallocation/*.model.yml
   - ext/allocation/*.model.yml
 warnOnImplicitThis: true
+compileForOverlayEval: true