diff --git a/binary_text_edit.py b/binary_text_edit.py
index 39d40b3..337b0bb 100644
--- a/binary_text_edit.py
+++ b/binary_text_edit.py
@@ -16,12 +16,10 @@ class BinaryTextEdit(QPlainTextEdit):  # rewrite QPlainTextEdit.keyPressEvent be
             if not (pos + 1) % 9 == 0 or event.text() in {"", None}:  # dont overwrite the separator character
                 super().keyPressEvent(event)
 
-            # skip over the separator character when the cursor is before it.
+            # skip over the separator character when the cursor is right before it.
             if (pos + 2) % 9 == 0 and not event.text() in {"", None}:
-                if pos == text_length:  # append to the input if the cursor is at the end
-                    self.insertPlainText("  ")
-                    cursor = self.textCursor()
-                    cursor.setPosition(pos + 2)
+                if pos == text_length - 1:  # append to the input if the cursor is at the end
+                    self.insertPlainText(" 00000000")
 
                 cursor.setPosition(pos + 2)
                 self.setTextCursor(cursor)