diff --git a/Godeps/Godeps.json b/Godeps/Godeps.json
index d963325b..17cc8ea9 100644
--- a/Godeps/Godeps.json
+++ b/Godeps/Godeps.json
@@ -264,7 +264,7 @@
 		},
 		{
 			"ImportPath": "k8s.io/apimachinery",
-			"Rev": "f97a4e5b4abc"
+			"Rev": "1f8faeb81191"
 		},
 		{
 			"ImportPath": "k8s.io/gengo",
diff --git a/go.mod b/go.mod
index 36fe9874..9c395380 100644
--- a/go.mod
+++ b/go.mod
@@ -27,7 +27,7 @@ require (
 	golang.org/x/time v0.0.0-20161028155119-f51c12702a4d
 	google.golang.org/appengine v1.5.0 // indirect
 	k8s.io/api v0.0.0-20190726022912-69e1bce1dad5
-	k8s.io/apimachinery v0.0.0-20190727130956-f97a4e5b4abc
+	k8s.io/apimachinery v0.0.0-20190730182816-1f8faeb81191
 	k8s.io/klog v0.3.1
 	k8s.io/utils v0.0.0-20190607212802-c55fbcfc754a
 	sigs.k8s.io/yaml v1.1.0
@@ -41,5 +41,5 @@ replace (
 	golang.org/x/text => golang.org/x/text v0.3.1-0.20181227161524-e6919f6577db
 	golang.org/x/tools => golang.org/x/tools v0.0.0-20190313210603-aa82965741a9
 	k8s.io/api => k8s.io/api v0.0.0-20190726022912-69e1bce1dad5
-	k8s.io/apimachinery => k8s.io/apimachinery v0.0.0-20190727130956-f97a4e5b4abc
+	k8s.io/apimachinery => k8s.io/apimachinery v0.0.0-20190730182816-1f8faeb81191
 )
diff --git a/go.sum b/go.sum
index 18a31bca..ffec1b60 100644
--- a/go.sum
+++ b/go.sum
@@ -125,7 +125,7 @@ gopkg.in/yaml.v2 v2.2.1/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
 gopkg.in/yaml.v2 v2.2.2 h1:ZCJp+EgiOT7lHqUV2J862kp8Qj64Jo6az82+3Td9dZw=
 gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
 k8s.io/api v0.0.0-20190726022912-69e1bce1dad5/go.mod h1:V6cpJ9D7WqSy0wqcE096gcbj+W//rshgQgmj1Shdwi8=
-k8s.io/apimachinery v0.0.0-20190727130956-f97a4e5b4abc/go.mod h1:eXR4ljjmbwK6Ng0PKsXRySPXnTUy/qBUa6kPDeckhQ0=
+k8s.io/apimachinery v0.0.0-20190730182816-1f8faeb81191/go.mod h1:eXR4ljjmbwK6Ng0PKsXRySPXnTUy/qBUa6kPDeckhQ0=
 k8s.io/gengo v0.0.0-20190128074634-0689ccc1d7d6/go.mod h1:ezvh/TsK7cY6rbqRK0oQQ8IAqLxYwwyPxAX1Pzy0ii0=
 k8s.io/klog v0.0.0-20181102134211-b9b56d5dfc92/go.mod h1:Gq+BEi5rUBO/HRz0bTSXDUcqjScdoY3a9IHpCEIOOfk=
 k8s.io/klog v0.3.0/go.mod h1:Gq+BEi5rUBO/HRz0bTSXDUcqjScdoY3a9IHpCEIOOfk=
diff --git a/tools/leaderelection/leaderelection.go b/tools/leaderelection/leaderelection.go
index 53523ddd..4be650c0 100644
--- a/tools/leaderelection/leaderelection.go
+++ b/tools/leaderelection/leaderelection.go
@@ -89,6 +89,12 @@ func NewLeaderElector(lec LeaderElectionConfig) (*LeaderElector, error) {
 	if lec.RetryPeriod < 1 {
 		return nil, fmt.Errorf("retryPeriod must be greater than zero")
 	}
+	if lec.Callbacks.OnStartedLeading == nil {
+		return nil, fmt.Errorf("OnStartedLeading callback must not be nil")
+	}
+	if lec.Callbacks.OnStoppedLeading == nil {
+		return nil, fmt.Errorf("OnStoppedLeading callback must not be nil")
+	}
 
 	if lec.Lock == nil {
 		return nil, fmt.Errorf("Lock must not be nil.")