diff --git a/src/ui/Forms/ChangeCasing.cs b/src/ui/Forms/ChangeCasing.cs
index 1d61e893d..712c01706 100644
--- a/src/ui/Forms/ChangeCasing.cs
+++ b/src/ui/Forms/ChangeCasing.cs
@@ -72,6 +72,7 @@ namespace Nikse.SubtitleEdit.Forms
                 FixMakeLowercase = radioButtonLowercase.Checked,
                 FixMakeProperCase = radioButtonProperCase.Checked,
                 FixProperCaseOnlyAllUppercase = checkBoxProperCaseOnlyUpper.Checked,
+                Format = subtitle.OriginalFormat,
             };
             fixCasing.Fix(subtitle);
             LinesChanged = fixCasing.NoOfLinesChanged;