diff --git a/Tranga/Chapter.cs b/Tranga/Chapter.cs
index 9beb14a..035c363 100644
--- a/Tranga/Chapter.cs
+++ b/Tranga/Chapter.cs
@@ -23,6 +23,6 @@ public struct Chapter
         string chapterName = string.Concat((name ?? "").Split(Path.GetInvalidFileNameChars()));
         double multiplied = Convert.ToDouble(chapterNumber, new NumberFormatInfo() { NumberDecimalSeparator = "." }) *
                             Convert.ToInt32(volumeNumber);
-        this.fileName = $"{chapterName} - V{volumeNumber}C{chapterNumber} - {multiplied}";
+        this.fileName = $"{chapterName} - V{volumeNumber}C{chapterNumber} - {multiplied.ToString(new NumberFormatInfo() { NumberDecimalSeparator = "." })}";
     }
 }
\ No newline at end of file