diff --git a/progress.go b/progress.go
index 9bb557e..dfd35e7 100644
--- a/progress.go
+++ b/progress.go
@@ -19,7 +19,7 @@
 )
 
 // DoneError represents an error when `*mpb.Progress` is done but its functionality is requested.
-var DoneError = fmt.Errorf("%T instance can't be reused after it's done!", (*Progress)(nil))
+var DoneError = fmt.Errorf("%T instance can't be reused after it's done", (*Progress)(nil))
 
 // Progress represents a container that renders one or more progress bars.
 type Progress struct {