diff --git a/runtime/testenv/testenv.go b/runtime/testenv/testenv.go
index ae149bc8..1fc4f265 100644
--- a/runtime/testenv/testenv.go
+++ b/runtime/testenv/testenv.go
@@ -52,13 +52,6 @@ var (
 	env *envtest.Environment
 )
 
-func init() {
-	klog.InitFlags(nil)
-	logger := klogr.New()
-	log.SetLogger(logger)
-	ctrl.SetLogger(logger)
-}
-
 var (
 	cacheSyncBackoff = wait.Backoff{
 		Duration: 100 * time.Millisecond,
@@ -118,7 +111,32 @@ func WithCRDPath(path ...string) Option {
 //
 // NOTE: This function should be called only once for each package you are running tests within, usually the environment
 // is initialised in a suite_test.go or <package>_test.go file within a `TestMain` function.
+//
+// When a testenv Environment is created, it initializes the
+// controller-runtime's deferred logger with a default logger based on klog. In
+// order to override this behavior, the controller-runtime logger can be
+// initialized before creating testenv Environment.
+//
+//  import (
+//      "testing"
+//
+//      "github.com/fluxcd/pkg/runtime/testenv"
+//      ctrl "sigs.k8s.io/controller-runtime"
+//      "sigs.k8s.io/controller-runtime/pkg/log/zap"
+//  }
+//
+//  func TestMain(m *testing.M) {
+//      zlog := zap.New(zap.UseDevMode(true))
+//      ctrl.SetLogger(zlog)
+//
+//      testEnv = testenv.New()
+//      ...
+//  }
+//
 func New(o ...Option) *Environment {
+	// Set a default logger if not set already.
+	log.SetLogger(klogr.New())
+
 	opts := options{}
 	for _, apply := range o {
 		apply(&opts)