diff --git a/OSBindings/Mac/Clock Signal/Base.lproj/Atari2600Document.xib b/OSBindings/Mac/Clock Signal/Base.lproj/Atari2600Document.xib
index 0b4c8c76b..226f770d5 100644
--- a/OSBindings/Mac/Clock Signal/Base.lproj/Atari2600Document.xib	
+++ b/OSBindings/Mac/Clock Signal/Base.lproj/Atari2600Document.xib	
@@ -18,6 +18,7 @@
             <windowPositionMask key="initialPositionMask" leftStrut="YES" rightStrut="YES" topStrut="YES" bottomStrut="YES"/>
             <rect key="contentRect" x="133" y="235" width="400" height="300"/>
             <rect key="screenRect" x="0.0" y="0.0" width="2560" height="1417"/>
+            <value key="minSize" type="size" width="228" height="171"/>
             <view key="contentView" id="gIp-Ho-8D9">
                 <rect key="frame" x="0.0" y="0.0" width="400" height="300"/>
                 <autoresizingMask key="autoresizingMask"/>