diff --git a/BlockStackApp.py b/BlockStackApp.py
index 1c7b788..e2b64c3 100644
--- a/BlockStackApp.py
+++ b/BlockStackApp.py
@@ -128,7 +128,7 @@ class BlockStackApp(QWidget):
         bottom_block_widget = QWidget()
         bottom_block_layout = QHBoxLayout()
         bottom_block_layout.setAlignment(Qt.AlignRight|Qt.AlignBottom)
-        bottom_block_layout.setSizePolicy(QSizePolicy.Expanding, QSizePolicy.Expanding)
+        bottom_block_widget.setSizePolicy(QSizePolicy.Expanding, QSizePolicy.Expanding)
 
         # Add a close button
         btn_close = QPushButton("Close")