diff --git a/cmd/kube-proxy/app/conntrack.go b/cmd/kube-proxy/app/conntrack.go
index ad9e0e52b72..941620643d1 100644
--- a/cmd/kube-proxy/app/conntrack.go
+++ b/cmd/kube-proxy/app/conntrack.go
@@ -129,7 +129,7 @@ func isSysFSWritable() (bool, error) {
 		return false, errReadOnlySysFS
 	}
 
-	return false, errors.New("No sysfs mounted")
+	return false, errors.New("no sysfs mounted")
 }
 
 func readIntStringFile(filename string) (int, error) {
diff --git a/cmd/kube-proxy/app/server.go b/cmd/kube-proxy/app/server.go
index 635fd0fc25d..0a201fac1d8 100644
--- a/cmd/kube-proxy/app/server.go
+++ b/cmd/kube-proxy/app/server.go
@@ -489,7 +489,7 @@ func (s *ProxyServer) Run() error {
 		encounteredError = iptables.CleanupLeftovers(s.IptInterface) || encounteredError
 		encounteredError = ipvs.CleanupLeftovers(s.IpvsInterface, s.IptInterface, s.IpsetInterface, s.CleanupIPVS) || encounteredError
 		if encounteredError {
-			return errors.New("encountered an error while tearing down rules.")
+			return errors.New("encountered an error while tearing down rules")
 		}
 		return nil
 	}
diff --git a/cmd/kube-proxy/app/server_others_test.go b/cmd/kube-proxy/app/server_others_test.go
index f439f6186f9..ff74280f38c 100644
--- a/cmd/kube-proxy/app/server_others_test.go
+++ b/cmd/kube-proxy/app/server_others_test.go
@@ -45,7 +45,7 @@ func Test_getProxyMode(t *testing.T) {
 		},
 		{ // flag says iptables, error detecting version
 			flag:          "iptables",
-			iptablesError: fmt.Errorf("oops!"),
+			iptablesError: fmt.Errorf("flag says iptables, error detecting version"),
 			expected:      proxyModeUserspace,
 		},
 		{ // flag says iptables, version too low
@@ -67,7 +67,7 @@ func Test_getProxyMode(t *testing.T) {
 		},
 		{ // detect, error
 			flag:          "",
-			iptablesError: fmt.Errorf("oops!"),
+			iptablesError: fmt.Errorf("oops"),
 			expected:      proxyModeUserspace,
 		},
 		{ // detect, version too low