diff --git a/creusot-contracts/Cargo.toml b/creusot-contracts/Cargo.toml
index 36bf8bf3b..f7edb1d95 100644
--- a/creusot-contracts/Cargo.toml
+++ b/creusot-contracts/Cargo.toml
@@ -9,10 +9,12 @@ description = "Provides contracts and logic helpers for Creusot"
 
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
-[dependencies]
+[target.'cfg(creusot)'.dependencies]
+num-rational = "0.3.2"
 creusot-contracts-proc = { path = "../creusot-contracts-proc", version = "0.3.0" }
+
+[target.'cfg(not(creusot))'.dependencies]
 creusot-contracts-dummy = { path = "../creusot-contracts-dummy", version = "0.3.0" }
-num-rational = "0.3.2"
 
 [features]
 default = []
diff --git a/creusot-rustc/src/main.rs b/creusot-rustc/src/main.rs
index a52b8a471..7ebd448ce 100644
--- a/creusot-rustc/src/main.rs
+++ b/creusot-rustc/src/main.rs
@@ -18,7 +18,7 @@ use rustc_driver::RunCompiler;
 use rustc_session::{config::ErrorOutputType, EarlyDiagCtxt};
 use std::{env, panic, process::Command};
 
-const BUG_REPORT_URL: &'static str = &"https://github.com/creusot-rs/creusot/issues/new";
+const BUG_REPORT_URL: &str = "https://github.com/creusot-rs/creusot/issues/new";
 
 struct DefaultCallbacks;
 impl rustc_driver::Callbacks for DefaultCallbacks {}
@@ -75,7 +75,10 @@ fn setup_plugin() {
             };
             RunCompiler::new(&args, &mut ToWhy::new(opts)).run().unwrap();
         }
-        _ => RunCompiler::new(&args, &mut DefaultCallbacks).run().unwrap(),
+        _ => {
+            args.push("--cfg=creusot".to_string());
+            RunCompiler::new(&args, &mut DefaultCallbacks).run().unwrap()
+        }
     }
 }