diff --git a/src/Views/CommitMessageToolBox.axaml.cs b/src/Views/CommitMessageToolBox.axaml.cs
index 214f7fd8b..90128444f 100644
--- a/src/Views/CommitMessageToolBox.axaml.cs
+++ b/src/Views/CommitMessageToolBox.axaml.cs
@@ -243,7 +243,7 @@ protected override void OnPropertyChanged(AvaloniaPropertyChangedEventArgs chang
                     }
                 }
 
-                if (lastLineStart < lastNonLineBreakCharIdx)
+                if (lastLineStart <= lastNonLineBreakCharIdx)
                 {
                     var validCharLen = text.Substring(lastLineStart).TrimEnd().Length;
                     if (subjectLen > 0)