diff --git a/gui_impl.py b/gui_impl.py
index 968eeee..444361d 100644
--- a/gui_impl.py
+++ b/gui_impl.py
@@ -16,9 +16,10 @@ class SpectrogramItem(pg.ImageItem):
         pg.ImageItem.__init__(self)
 
         depth = 100
+        self.setOpts(axisOrder="row-major")
         self.img_array = np.zeros((depth, block_size))
         self.setImage(self.img_array, autoLevels=True, autoDownsample=True)
-        self.setRect(QtCore.QRectF(0.0, (freq_base-freq_sample/2)/1e6, float(depth), freq_sample/1e6))
+        self.setRect(QtCore.QRectF((freq_base-freq_sample/2)/1e6, -float(depth), freq_sample/1e6, float(depth)))
 
     def add_block(self, block):
         self.img_array = np.roll(self.img_array, -1, 0)