diff --git a/src/runtime/mod.rs b/src/runtime/mod.rs
index 05cc55a8a82015c43ca9384734e9a1b0a54be8ff..deeeaa443d29def446a15f508ead3d5603ba5bcd 100644
--- a/src/runtime/mod.rs
+++ b/src/runtime/mod.rs
@@ -109,6 +109,7 @@ struct ControllerInner {
     mono_n: Option<MonoN>,
     mono_ps: Vec<MonoP>,
     family: ControllerFamily,
+    logger: String,
 }
 
 /// This structure has its state entirely reset between synchronous rounds