diff --git a/b_asic/GUI/_preferences.py b/b_asic/GUI/_preferences.py
index 8ec13464dfbe6742f22f147168bb0255db9f227b..d899e77101bf1b4b3f901f6304f1b10158aa15a2 100644
--- a/b_asic/GUI/_preferences.py
+++ b/b_asic/GUI/_preferences.py
@@ -5,7 +5,7 @@ from b_asic._preferences import SIGNAL_COLOR
 # Buttons/operations/ports
 MINBUTTONSIZE = 57
 PORTHEIGHT = 19
-PORTWIDTH = 15
+PORTWIDTH = 19
 GAP = MINBUTTONSIZE - 2 * PORTHEIGHT
 
 # Window
diff --git a/b_asic/GUI/drag_button.py b/b_asic/GUI/drag_button.py
index 09184d177b0e7bd7afc3e47bc02434918a27e9d7..a07f0e79b81864b3542e023cebb0379c527ae2df 100644
--- a/b_asic/GUI/drag_button.py
+++ b/b_asic/GUI/drag_button.py
@@ -249,12 +249,14 @@ class DragButton(QPushButton):
         input_ports_dist = _determine_port_distance(height, op.input_count)
         for i, dist in enumerate(input_ports_dist):
             port = PortButton(">", self, op.input(i), self._window)
-            self.ports.append(port)
+            port.setFixedSize(PORTWIDTH, PORTHEIGHT)
             port.move(0, dist)
             port.show()
+            self.ports.append(port)
 
         for i, dist in enumerate(output_ports_dist):
             port = PortButton(">", self, op.output(i), self._window)
-            self.ports.append(port)
+            port.setFixedSize(PORTWIDTH, PORTHEIGHT)
             port.move(MINBUTTONSIZE - PORTWIDTH, dist)
             port.show()
+            self.ports.append(port)