diff --git a/pkg/kubelet/dockertools/manager.go b/pkg/kubelet/dockertools/manager.go
index 1332ff0b354..db39e0bc32e 100644
--- a/pkg/kubelet/dockertools/manager.go
+++ b/pkg/kubelet/dockertools/manager.go
@@ -1953,7 +1953,7 @@ func (dm *DockerManager) SyncPod(pod *api.Pod, runningPod kubecontainer.Pod, pod
 	}
 
 	if containersStarted != len(containerChanges.ContainersToStart) {
-		return fmt.Errorf("not all containers have started: %d != %d", containersStarted, containerChanges.ContainersToStart)
+		return fmt.Errorf("not all containers have started: %d != %d", containersStarted, len(containerChanges.ContainersToStart))
 	}
 	return nil
 }