diff --git a/pkg/util/expectations/resource_version_expectation.go b/pkg/util/expectations/resource_version_expectation.go
index b01e2e798..00e237467 100644
--- a/pkg/util/expectations/resource_version_expectation.go
+++ b/pkg/util/expectations/resource_version_expectation.go
@@ -36,7 +36,7 @@ func NewResourceVersionExpectation() ResourceVersionExpectation {
 }
 
 type realResourceVersionExpectation struct {
-	sync.RWMutex
+	sync.Mutex
 	objectVersions map[types.UID]string
 }
 
@@ -57,8 +57,8 @@ func (r *realResourceVersionExpectation) Observe(obj metav1.Object) {
 }
 
 func (r *realResourceVersionExpectation) IsSatisfied(obj metav1.Object) bool {
-	r.RLock()
-	defer r.RUnlock()
+	r.Lock()
+	defer r.Unlock()
 	if isResourceVersionNewer(r.objectVersions[obj.GetUID()], obj.GetResourceVersion()) {
 		delete(r.objectVersions, obj.GetUID())
 	}
diff --git a/pkg/util/expectations/scale_expectations.go b/pkg/util/expectations/scale_expectations.go
index ee342fc71..e9ee5e810 100644
--- a/pkg/util/expectations/scale_expectations.go
+++ b/pkg/util/expectations/scale_expectations.go
@@ -33,7 +33,7 @@ func NewScaleExpectations() ScaleExpectations {
 }
 
 type realScaleExpectations struct {
-	sync.RWMutex
+	sync.Mutex
 	// key: parent key, workload namespace/name
 	controllerCache map[string]*realControllerScaleExpectations
 }
diff --git a/pkg/util/expectations/update_expectations.go b/pkg/util/expectations/update_expectations.go
index 35b839384..aca90871d 100644
--- a/pkg/util/expectations/update_expectations.go
+++ b/pkg/util/expectations/update_expectations.go
@@ -41,7 +41,7 @@ func NewUpdateExpectations(getRevision func(metav1.Object) string) UpdateExpecta
 }
 
 type realUpdateExpectations struct {
-	sync.RWMutex
+	sync.Mutex
 	// key: parent key, workload namespace/name
 	controllerCache map[string]*realControllerUpdateExpectations
 	// how to get pod revision