Default to GL sim
diff --git a/verilog/dv/vdp_lite/core.mk b/verilog/dv/vdp_lite/core.mk
index 8b077a1..5dfdda0 100644
--- a/verilog/dv/vdp_lite/core.mk
+++ b/verilog/dv/vdp_lite/core.mk
@@ -16,7 +16,7 @@
 
 # Enables the verilog/gl/vdp_lite_user_proj.v instead
 # This is taken from the *.powered.lvs generated by the openlane flow
-GL_SIM ?= 0
+GL_SIM ?= 1
 
 ###