diff --git a/pkg/controller/podautoscaler/metrics/metrics_client.go b/pkg/controller/podautoscaler/metrics/metrics_client.go
index 76a2387c869..623a8fce2cb 100644
--- a/pkg/controller/podautoscaler/metrics/metrics_client.go
+++ b/pkg/controller/podautoscaler/metrics/metrics_client.go
@@ -88,7 +88,7 @@ func (h *HeapsterMetricsClient) GetResourceMetric(resource api.ResourceName, nam
 		ProxyGet(h.heapsterScheme, h.heapsterService, h.heapsterPort, metricPath, params).
 		DoRaw()
 	if err != nil {
-		return nil, time.Time{}, fmt.Errorf("failed to get pod resource metrics: %v", err)
+		return nil, time.Time{}, fmt.Errorf("failed to get heapster service: %v", err)
 	}
 
 	glog.V(4).Infof("Heapster metrics result: %s", string(resultRaw))
@@ -158,7 +158,7 @@ func (h *HeapsterMetricsClient) GetRawMetric(metricName string, namespace string
 		ProxyGet(h.heapsterScheme, h.heapsterService, h.heapsterPort, metricPath, map[string]string{"start": startTime.Format(time.RFC3339)}).
 		DoRaw()
 	if err != nil {
-		return nil, time.Time{}, fmt.Errorf("failed to get pod metrics: %v", err)
+		return nil, time.Time{}, fmt.Errorf("failed to get heapster service: %v", err)
 	}
 
 	var metrics heapster.MetricResultList
diff --git a/pkg/controller/podautoscaler/replica_calculator.go b/pkg/controller/podautoscaler/replica_calculator.go
index 4074b7801e7..1618cbda88f 100644
--- a/pkg/controller/podautoscaler/replica_calculator.go
+++ b/pkg/controller/podautoscaler/replica_calculator.go
@@ -116,7 +116,7 @@ func (c *ReplicaCalculator) GetResourceReplicas(currentReplicas int32, targetUti
 			for podName := range missingPods {
 				metrics[podName] = requests[podName]
 			}
-		} else {
+		} else if usageRatio > 1.0 {
 			// on a scale-up, treat missing pods as using 0% of the resource request
 			for podName := range missingPods {
 				metrics[podName] = 0
diff --git a/pkg/controller/podautoscaler/replica_calculator_test.go b/pkg/controller/podautoscaler/replica_calculator_test.go
index 0819cc406fc..3defba8fee1 100644
--- a/pkg/controller/podautoscaler/replica_calculator_test.go
+++ b/pkg/controller/podautoscaler/replica_calculator_test.go
@@ -482,6 +482,105 @@ func TestReplicaCalcEmptyCPURequest(t *testing.T) {
 	tc.runTest(t)
 }
 
+func TestReplicaCalcMissingMetricsNoChangeEq(t *testing.T) {
+	tc := replicaCalcTestCase{
+		currentReplicas:  2,
+		expectedReplicas: 2,
+		resource: &resourceInfo{
+			name:     api.ResourceCPU,
+			requests: []resource.Quantity{resource.MustParse("1.0"), resource.MustParse("1.0")},
+			levels:   []int64{1000},
+
+			targetUtilization:   100,
+			expectedUtilization: 100,
+		},
+	}
+	tc.runTest(t)
+}
+
+func TestReplicaCalcMissingMetricsNoChangeGt(t *testing.T) {
+	tc := replicaCalcTestCase{
+		currentReplicas:  2,
+		expectedReplicas: 2,
+		resource: &resourceInfo{
+			name:     api.ResourceCPU,
+			requests: []resource.Quantity{resource.MustParse("1.0"), resource.MustParse("1.0")},
+			levels:   []int64{1900},
+
+			targetUtilization:   100,
+			expectedUtilization: 190,
+		},
+	}
+	tc.runTest(t)
+}
+
+func TestReplicaCalcMissingMetricsNoChangeLt(t *testing.T) {
+	tc := replicaCalcTestCase{
+		currentReplicas:  2,
+		expectedReplicas: 2,
+		resource: &resourceInfo{
+			name:     api.ResourceCPU,
+			requests: []resource.Quantity{resource.MustParse("1.0"), resource.MustParse("1.0")},
+			levels:   []int64{600},
+
+			targetUtilization:   100,
+			expectedUtilization: 60,
+		},
+	}
+	tc.runTest(t)
+}
+
+func TestReplicaCalcMissingMetricsUnreadyNoChange(t *testing.T) {
+	tc := replicaCalcTestCase{
+		currentReplicas:  3,
+		expectedReplicas: 3,
+		podReadiness:     []api.ConditionStatus{api.ConditionFalse, api.ConditionTrue, api.ConditionTrue},
+		resource: &resourceInfo{
+			name:     api.ResourceCPU,
+			requests: []resource.Quantity{resource.MustParse("1.0"), resource.MustParse("1.0"), resource.MustParse("1.0")},
+			levels:   []int64{100, 450},
+
+			targetUtilization:   50,
+			expectedUtilization: 45,
+		},
+	}
+	tc.runTest(t)
+}
+
+func TestReplicaCalcMissingMetricsUnreadyScaleUp(t *testing.T) {
+	tc := replicaCalcTestCase{
+		currentReplicas:  3,
+		expectedReplicas: 4,
+		podReadiness:     []api.ConditionStatus{api.ConditionFalse, api.ConditionTrue, api.ConditionTrue},
+		resource: &resourceInfo{
+			name:     api.ResourceCPU,
+			requests: []resource.Quantity{resource.MustParse("1.0"), resource.MustParse("1.0"), resource.MustParse("1.0")},
+			levels:   []int64{100, 2000},
+
+			targetUtilization:   50,
+			expectedUtilization: 200,
+		},
+	}
+	tc.runTest(t)
+}
+
+func TestReplicaCalcMissingMetricsUnreadyScaleDown(t *testing.T) {
+	tc := replicaCalcTestCase{
+		currentReplicas:  4,
+		expectedReplicas: 3,
+		podReadiness:     []api.ConditionStatus{api.ConditionFalse, api.ConditionTrue, api.ConditionTrue, api.ConditionTrue},
+		resource: &resourceInfo{
+			name:     api.ResourceCPU,
+			requests: []resource.Quantity{resource.MustParse("1.0"), resource.MustParse("1.0"), resource.MustParse("1.0"), resource.MustParse("1.0")},
+			levels:   []int64{100, 100, 100},
+
+			targetUtilization:   50,
+			expectedUtilization: 10,
+		},
+	}
+	tc.runTest(t)
+}
+
 // TestComputedToleranceAlgImplementation is a regression test which
 // back-calculates a minimal percentage for downscaling based on a small percentage
 // increase in pod utilization which is calibrated against the tolerance value.