diff --git a/zcash_fpga/src/tb/secp256k1_point_dbl_tb.sv b/zcash_fpga/src/tb/secp256k1_point_dbl_tb.sv
index d973d8d..95b081a 100644
--- a/zcash_fpga/src/tb/secp256k1_point_dbl_tb.sv
+++ b/zcash_fpga/src/tb/secp256k1_point_dbl_tb.sv
@@ -130,7 +130,7 @@ begin
   $display("Running test_0...");
   //p_in = {z:1, x:4, y:2};
   //p_in = {z:10, x:64, y:23};
-  p_in = secp256k1_pkg::G_p;
+  p_in = {x:secp256k1_pkg::Gx, y:secp256k1_pkg::Gx, z:1};
   p_exp = dbl_jb_point(p_in);
   
   fork