diff --git a/lib/solaar/ui/window.py b/lib/solaar/ui/window.py
index ea971808..9f6b952c 100644
--- a/lib/solaar/ui/window.py
+++ b/lib/solaar/ui/window.py
@@ -451,7 +451,7 @@ def _update_details(button):
 
 			yield ('Serial', device.serial)
 
-			for fw in device.firmware:
+			for fw in list(device.firmware):
 				yield (fw.kind, (fw.name + ' ' + fw.version).strip())
 
 			flag_bits = device.status.get(_NOTFITICATIONS)