diff --git a/api/v1alpha1/githubactionrunner_types.go b/api/v1alpha1/githubactionrunner_types.go
index 392f173e..a20ccb53 100644
--- a/api/v1alpha1/githubactionrunner_types.go
+++ b/api/v1alpha1/githubactionrunner_types.go
@@ -1,6 +1,7 @@
 package v1alpha1
 
 import (
+	"errors"
 	v1 "k8s.io/api/core/v1"
 	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
 	"time"
@@ -41,6 +42,15 @@ type GithubActionRunnerSpec struct {
 	ReconciliationPeriod string `json:"reconciliationPeriod"`
 }
 
+// Spec level validation that is not covered by basic OpenAPI constraints
+func (r GithubActionRunnerSpec) IsValid() (bool, error){
+	if r.MaxRunners < r.MinRunners {
+		return false, errors.New("MaxRunners must be greater or equal to minRunners")
+	}
+
+	return true, nil
+}
+
 // GetReconciliationPeriod returns period as a Duration
 func (r GithubActionRunnerSpec) GetReconciliationPeriod() time.Duration {
 	duration, err := time.ParseDuration(r.ReconciliationPeriod)
diff --git a/controllers/githubactionrunner_controller.go b/controllers/githubactionrunner_controller.go
index 08c2365f..f2889f82 100644
--- a/controllers/githubactionrunner_controller.go
+++ b/controllers/githubactionrunner_controller.go
@@ -55,11 +55,7 @@ func (r *GithubActionRunnerReconciler) IsValid(obj metav1.Object) (bool, error)
 	if !ok {
 		return false, errors.New("not a GithubActionRunner object")
 	}
-	if instance.Spec.MaxRunners < instance.Spec.MinRunners {
-		return false, errors.New("MaxRunners must be greater or equal to minRunners")
-	}
-
-	return true, nil
+	return instance.Spec.IsValid()
 }
 
 // +kubebuilder:rbac:groups=garo.tietoevry.com,resources=githubactionrunners,verbs=get;list;watch;create;update;patch;delete