diff --git a/rtl/apple1_top.v b/rtl/apple1_top.v
index fc2cbff..1a2ce9d 100644
--- a/rtl/apple1_top.v
+++ b/rtl/apple1_top.v
@@ -26,7 +26,7 @@ module top(
 
     //////////////////////////////////////////////////////////////////////////
     // Clocks
-    wire cpu_clken;
+    reg cpu_clken;
 
     // FIXME:
     // the clocks here should come from higher up