diff --git a/psychopy_eyetracker_pupil_labs/pupil_labs/components.py b/psychopy_eyetracker_pupil_labs/pupil_labs/components.py
index 8ef3da4..9c1cff1 100644
--- a/psychopy_eyetracker_pupil_labs/pupil_labs/components.py
+++ b/psychopy_eyetracker_pupil_labs/pupil_labs/components.py
@@ -109,7 +109,7 @@ class AprilTagFrameComponent(BaseVisualComponent):
     iconFile = Path(__file__).parent.parent / 'apriltag_frame.png'
     tooltip = _translate('AprilTag: Markers to identify a screen surface')
 
-    def __init__(self, exp, parentName, h_count=3, v_count=3, marker_ids='', marker_size=0.125, marker_units="from exp settings", anchor="center", size=[2, 2], units="norm", startType='time (s)', startVal=0.0, *args, **kwargs):
+    def __init__(self, exp, parentName, h_count=4, v_count=3, marker_ids='', marker_size=0.125, marker_units="from exp settings", anchor="center", size=[2, 2], units="norm", startType='time (s)', startVal=0.0, *args, **kwargs):
         super().__init__(exp, parentName, size=size, units=units, startType=startType, startVal=startVal, *args, **kwargs)
 
         self.type = 'Image'
diff --git a/psychopy_eyetracker_pupil_labs/pupil_labs/stimuli.py b/psychopy_eyetracker_pupil_labs/pupil_labs/stimuli.py
index b498e27..b2ffbd3 100644
--- a/psychopy_eyetracker_pupil_labs/pupil_labs/stimuli.py
+++ b/psychopy_eyetracker_pupil_labs/pupil_labs/stimuli.py
@@ -49,7 +49,7 @@ def marker_verts(self):
 
 
 class AprilTagFrameStim(ImageStim):
-    def __init__(self, h_count=3, v_count=3, marker_ids=None, marker_size=0.125, marker_units='', contrast=1.0, *args, **kwargs):
+    def __init__(self, h_count=4, v_count=3, marker_ids=None, marker_size=0.125, marker_units='', contrast=1.0, *args, **kwargs):
         super().__init__(*args, **kwargs)
 
         self.marker_verts = {}