diff --git a/src/main/scala/millfork/parser/AbstractSourceLoadingQueue.scala b/src/main/scala/millfork/parser/AbstractSourceLoadingQueue.scala
index c2b1aec0..8553d4d5 100644
--- a/src/main/scala/millfork/parser/AbstractSourceLoadingQueue.scala
+++ b/src/main/scala/millfork/parser/AbstractSourceLoadingQueue.scala
@@ -60,13 +60,13 @@ abstract class AbstractSourceLoadingQueue[T](val initialFilenames: List[String],
     options.log.debug(s"Parsing $filename")
     val path = Paths.get(filename)
     val parentDir = path.toFile.getAbsoluteFile.getParent
-    val PreprocessingResult(src, featureConstants, pragmas) = Preprocessor(options, Files.readAllLines(path, StandardCharsets.UTF_8).toIndexedSeq)
+    val shortFileName = path.getFileName.toString
+    val PreprocessingResult(src, featureConstants, pragmas) = Preprocessor(options, shortFileName, Files.readAllLines(path, StandardCharsets.UTF_8).toIndexedSeq)
     for (pragma <- pragmas) {
       if (!supportedPragmas(pragma._1)) {
         options.log.warn(s"Unsupported pragma: #pragma $pragma", Some(Position(moduleName, pragma._2, 1, 0)))
       }
     }
-    val shortFileName = path.getFileName.toString
     val parser = createParser(shortFileName, src, parentDir, featureConstants, pragmas.keySet)
     options.log.addSource(shortFileName, src.lines.toIndexedSeq)
     parser.toAst match {
diff --git a/src/main/scala/millfork/parser/Preprocessor.scala b/src/main/scala/millfork/parser/Preprocessor.scala
index a4e8f909..467b6f4d 100644
--- a/src/main/scala/millfork/parser/Preprocessor.scala
+++ b/src/main/scala/millfork/parser/Preprocessor.scala
@@ -18,12 +18,12 @@ object Preprocessor {
   private val Regex = raw"\A\s*#\s*([a-z]+)\s*(.*?)\s*\z".r
 
   def preprocessForTest(options: CompilationOptions, code: String): PreprocessingResult = {
-    apply(options, code.lines.toSeq)
+    apply(options, "", code.lines.toSeq)
   }
 
   case class IfContext(hadEnabled: Boolean, hadElse: Boolean, enabledBefore: Boolean)
 
-  def apply(options: CompilationOptions, lines: Seq[String]): PreprocessingResult = {
+  def apply(options: CompilationOptions, shortFileName: String, lines: Seq[String]): PreprocessingResult = {
     val platform = options.platform
     val log = options.log
 //    if (log.traceEnabled) {
@@ -55,7 +55,7 @@ object Preprocessor {
       var resulting = ""
       line match {
         case Regex(keyword, param) =>
-          val pos = Some(Position("", lineNo, 0, 0))
+          val pos = Some(Position(shortFileName, lineNo, 0, 0))
           keyword match {
             case "use" => if (enabled) {
               if (param == "") log.error("#use should have a parameter", pos)