diff --git a/SaneTsv/SaneTsv.cs b/SaneTsv/SaneTsv.cs
index e828d9b..1ff839c 100644
--- a/SaneTsv/SaneTsv.cs
+++ b/SaneTsv/SaneTsv.cs
@@ -231,8 +231,11 @@ public class SaneTsv
           {
             var commentBytes = new byte[j - i - 1];
             Array.Copy(inputBuffer, i + 1, commentBytes, 0, j - i - 1);
+            if (currentComment.Length > 0)
+            {
+              currentComment.Append('\n');
+            }
             currentComment.Append(Encoding.UTF8.GetString(commentBytes));
-            currentComment.Append("\n");
             i = j;
             currentLineStart = i + 1;
             line++;