diff --git a/src/gui_qt/io/asciireader.py b/src/gui_qt/io/asciireader.py
index 5fb765b..924bcec 100644
--- a/src/gui_qt/io/asciireader.py
+++ b/src/gui_qt/io/asciireader.py
@@ -133,7 +133,7 @@ class QAsciiReader(QtWidgets.QDialog, Ui_ascii_reader):
         if self.column_checkBox.isChecked() and self.line_spinBox.isEnabled():
             header_line = self.reader.header[self.line_spinBox.value()-1]
             header_line = header_line.strip('\n\t\r, ')
-            header_line = re.sub(r'[\t ;,]+', ';', header_line)
+            header_line = re.sub(r'[\t, ;]+(?!\w*})', ';', header_line)
 
             self.ascii_table.setHorizontalHeaderLabels(header_line.split(';'))