diff --git a/src/yggdrasil/debug.go b/src/yggdrasil/debug.go
index 5cb7c46..ff3bbe7 100644
--- a/src/yggdrasil/debug.go
+++ b/src/yggdrasil/debug.go
@@ -35,9 +35,9 @@ func init() {
 	hostPort := os.Getenv(envVarName)
 	switch {
 	case hostPort == "":
-		fmt.Printf("DEBUG: %s not set, profiler not started.\n", envVarName)
+		fmt.Fprintf(os.Stderr, "DEBUG: %s not set, profiler not started.\n", envVarName)
 	default:
-		fmt.Printf("DEBUG: Starting pprof on %s\n", hostPort)
+		fmt.Fprintf(os.Stderr, "DEBUG: Starting pprof on %s\n", hostPort)
 		go func() { fmt.Println(http.ListenAndServe(hostPort, nil)) }()
 	}
 }