diff --git a/main.py b/main.py
index 63c3d0e..73fe02b 100644
--- a/main.py
+++ b/main.py
@@ -56,6 +56,7 @@ class MainWindow(QMainWindow):
         self.ui.pb_con_horiz.pressed.connect(self.act_constrain_horiz_line_mode)
         self.ui.pb_con_vert.pressed.connect(self.act_constrain_vert_line_mode)
         self.ui.pb_con_dist.pressed.connect(self.act_constrain_distance_mode)
+        self.ui.pb_con_mid.pressed.connect(self.act_constrain_mid_point_mode)
 
         ### Operations
         self.ui.pb_extrdop.pressed.connect(self.send_extrude)
@@ -79,7 +80,7 @@ class MainWindow(QMainWindow):
             self.sketchWidget.points = []
 
     def act_constrain_pt_pt_mode(self):
-        if not self.ui.pb_linetool.isChecked():
+        if not self.ui.pb_con_ptpt.isChecked():
             self.sketchWidget.mouse_mode = 'pt_pt'
         else:
             self.sketchWidget.mouse_mode = None