diff --git a/vsrc/TestDriver.v b/vsrc/TestDriver.v
index 3b266044..5ee28e41 100644
--- a/vsrc/TestDriver.v
+++ b/vsrc/TestDriver.v
@@ -1,12 +1,16 @@
 // See LICENSE for license details.
 
+`ifndef RESET_DELAY
+ `define RESET_DELAY 777.7
+`endif
+
 module TestDriver;
 
   reg clock = 1'b0;
   reg reset = 1'b1;
 
-  always #(`CLOCK_PERIOD/2.0) clock = ~clock;
-  initial #777.7 reset = 0;
+  always #(`CLOCK_PERIOD/2.0) clk = ~clk;
+  initial #(`RESET_DELAY) reset = 0;
 
   // Read input arguments and initialize
   reg verbose = 1'b0;