diff --git a/compiler/extccomp.nim b/compiler/extccomp.nim
index 0eaba4600..d2d86bf58 100644
--- a/compiler/extccomp.nim
+++ b/compiler/extccomp.nim
@@ -678,7 +678,7 @@ proc footprint(conf: ConfigRef; cfile: Cfile): SecureHash =
     getCompileCFileCmd(conf, cfile))
 
 proc externalFileChanged(conf: ConfigRef; cfile: Cfile): bool =
-  if conf.cmd notin {cmdCompileToC, cmdCompileToCpp, cmdCompileToOC, cmdCompileToLLVM}:
+  if conf.cmd notin {cmdCompileToC, cmdCompileToCpp, cmdCompileToOC, cmdCompileToLLVM, cmdNone}:
     return false
 
   var hashFile = toGeneratedFile(conf, conf.withPackageName(cfile.cname), "sha1")