diff --git a/js/src/main/scala/io/kaitai/struct/format/JavaScriptClassSpecs.scala b/js/src/main/scala/io/kaitai/struct/format/JavaScriptClassSpecs.scala
index 049bca176..b95b988a6 100644
--- a/js/src/main/scala/io/kaitai/struct/format/JavaScriptClassSpecs.scala
+++ b/js/src/main/scala/io/kaitai/struct/format/JavaScriptClassSpecs.scala
@@ -1,8 +1,10 @@
 package io.kaitai.struct.format
 
 import io.kaitai.struct.JavaScriptImporter
+import io.kaitai.struct.problems.ErrorInInput
 
 import scala.concurrent.Future
+import scala.concurrent.ExecutionContext
 import scala.scalajs.concurrent.JSExecutionContext
 
 class JavaScriptClassSpecs(importer: JavaScriptImporter, firstSpec: ClassSpec)
@@ -12,13 +14,19 @@ class JavaScriptClassSpecs(importer: JavaScriptImporter, firstSpec: ClassSpec)
   val MODE_ABS = "abs"
 
   override def importRelative(name: String, path: List[String], inFile: Option[String]): Future[Option[ClassSpec]] =
-    doImport(name, MODE_REL)
+    doImport(name, path, MODE_REL)
   override def importAbsolute(name: String, path: List[String], inFile: Option[String]): Future[Option[ClassSpec]] =
-    doImport(name, MODE_ABS)
+    doImport(name, path, MODE_ABS)
 
-  def doImport(name: String, mode: String): Future[Option[ClassSpec]] =
-    importer.importYaml(name, mode).toFuture.map { (yaml) =>
-      val yamlScala = JavaScriptKSYParser.yamlJavascriptToScala(yaml)
-      Some(ClassSpec.fromYaml(yamlScala, Some(name)))
-    }(JSExecutionContext.queue)
+  def doImport(name: String, path: List[String], mode: String): Future[Option[ClassSpec]] = {
+    implicit val ec: ExecutionContext = JSExecutionContext.queue
+
+    importer.importYaml(name, mode).toFuture
+      .transform((yaml) => {
+        val yamlScala = JavaScriptKSYParser.yamlJavascriptToScala(yaml)
+        Some(ClassSpec.fromYaml(yamlScala, Some(name)))
+      }, (err) => {
+        throw ErrorInInput(err, path).toException
+      })
+  }
 }