diff --git a/sim/simulation.lua b/sim/simulation.lua
index 9ef6351..15b0c9a 100644
--- a/sim/simulation.lua
+++ b/sim/simulation.lua
@@ -8,7 +8,12 @@ ffi.cdef [[
 	void sim_update_nets();
 	void sim_update_gates();
 ]]
-local csim = ffi.load("./compiled_sim")
+local csim
+if jit.os=="Windows" then
+	csim = ffi.load("./compiled_sim.dll")
+else
+	csim = ffi.load("./compiled_sim.so")
+end
 
 Simulation = {}