diff --git a/container.go b/container.go
index adb160216..872bbb000 100644
--- a/container.go
+++ b/container.go
@@ -626,7 +626,7 @@ func (container *Container) WaitTimeout(timeout time.Duration) error {
 	case <-done:
 		return nil
 	}
-	return nil
+	panic("unreachable")
 }
 
 func (container *Container) EnsureMounted() error {
diff --git a/network.go b/network.go
index c050609d1..e92a4e540 100644
--- a/network.go
+++ b/network.go
@@ -184,7 +184,7 @@ func (alloc *PortAllocator) Release(port int) error {
 	default:
 		return errors.New("Too many ports have been released")
 	}
-	return nil
+	panic("unreachable")
 }
 
 func newPortAllocator(start, end int) (*PortAllocator, error) {
diff --git a/utils.go b/utils.go
index e295239f7..5ee84239b 100644
--- a/utils.go
+++ b/utils.go
@@ -202,7 +202,7 @@ func (r *bufReader) Read(p []byte) (n int, err error) {
 		}
 		r.wait.Wait()
 	}
-	return
+	panic("unreachable")
 }
 
 func (r *bufReader) Close() error {