diff --git a/crates/codspeed/src/codspeed.rs b/crates/codspeed/src/codspeed.rs
index 4a9db8a7..490f3370 100644
--- a/crates/codspeed/src/codspeed.rs
+++ b/crates/codspeed/src/codspeed.rs
@@ -7,7 +7,7 @@ pub use std::hint::black_box;
 pub const WARMUP_RUNS: u32 = 5;
 
 pub fn display_native_harness() {
-    println!("Harness: codspeed v{}", env!("CARGO_PKG_VERSION"),);
+    eprintln!("Harness: codspeed v{}", env!("CARGO_PKG_VERSION"),);
 }
 
 #[derive(PartialEq)]
@@ -52,8 +52,8 @@ impl CodSpeed {
             }
         };
 
-        if instrumentation_status.is_instrumented() {
-            println!(
+        if !instrumentation_status.is_instrumented() {
+            eprintln!(
                 "{} codspeed is enabled, but no performance measurement will be made since it's running in an unknown environment.",
                 "NOTICE:".to_string().bold()
             );