diff --git a/CHANGELOG.md b/CHANGELOG.md
index b839137c..a0d03843 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -26,6 +26,7 @@ CHANGELOG for FlatCAM beta
 - fixed Tcl command Copper Clear (NCC)
 - fixed Tcl command Paint
 - temporary fix for comboboxes not finding the the value in the items when setting themselves with a value by defaulting to the first item in the list
+- fix in Tool Subtract where there was a typo
 
 27.10.2020
 
diff --git a/appGUI/GUIElements.py b/appGUI/GUIElements.py
index 1f8e8d5f..efa2d160 100644
--- a/appGUI/GUIElements.py
+++ b/appGUI/GUIElements.py
@@ -2133,8 +2133,8 @@ class FCComboBox(QtWidgets.QComboBox):
         idx = self.findText(str(val))
         if idx == -1:
             self.setCurrentIndex(0)
-        else:
-            self.setCurrentIndex(idx)
+            return
+        self.setCurrentIndex(idx)
 
     @property
     def is_last(self):
diff --git a/appTools/ToolSub.py b/appTools/ToolSub.py
index 42111146..9b2c555a 100644
--- a/appTools/ToolSub.py
+++ b/appTools/ToolSub.py
@@ -205,7 +205,7 @@ class ToolSub(AppTool):
 
             app_obj.inform.emit("%s" % _("Subtraction aperture processing finished."))
 
-            outname = self.target_gerber_combo.currentText() + '_sub'
+            outname = self.ui.target_gerber_combo.currentText() + '_sub'
             self.aperture_processing_finished.emit(outname, output)
 
         self.app.worker_task.emit({'fcn': worker_job, 'params': [self.app]})