diff --git a/progress.go b/progress.go
index f70e2aa..378b9ca 100644
--- a/progress.go
+++ b/progress.go
@@ -367,7 +367,7 @@
 		s.pool = append(s.pool, b)
 	}
 
-	switch l := len(s.pool); l {
+	switch len(s.pool) {
 	case 0:
 		if s.heapUpdated {
 			s.updateSyncMatrix()