diff --git a/pypeit/core/gui/identify.py b/pypeit/core/gui/identify.py
index 46c3b26b0e..9ec147cfa8 100644
--- a/pypeit/core/gui/identify.py
+++ b/pypeit/core/gui/identify.py
@@ -272,11 +272,7 @@ def initialise(cls, arccen, lamps, slits, slit=0, par=None, wv_calib_all=None,
         detns = tdetns[icut]
 
         # Load line lists
-        if 'ThAr' in lamps:
-            line_lists_all = waveio.load_line_lists(lamps)
-            line_lists = line_lists_all[np.where(line_lists_all['ion'] != 'UNKNWN')]
-        else:
-            line_lists = waveio.load_line_lists(lamps)
+        line_lists, _, _ = waveio.load_line_lists(lamps, include_unknown=False)
 
         # Trim the wavelength scale if requested
         if wavelim is not None: