diff --git a/codex.nimble b/codex.nimble
index 572c5b5b..9dda10ba 100644
--- a/codex.nimble
+++ b/codex.nimble
@@ -37,8 +37,14 @@ proc buildBinary(name: string, srcDir = "./", params = "", lang = "c") =
     mkDir "build"
   # allow something like "nim nimbus --verbosity:0 --hints:off nimbus.nims"
   var extra_params = params
-  for i in 2..<paramCount():
-    extra_params &= " " & paramStr(i)
+  when compiles(commandLineParams):
+    for param in commandLineParams:
+      extra_params &= " " & param
+  else:
+    for i in 2..<paramCount():
+      extra_params &= " " & paramStr(i)
+
+
   exec "nim " & lang & " --out:build/" & name & " " & extra_params & " " & srcDir & name & ".nim"
 
 proc test(name: string, srcDir = "tests/", lang = "c") =