diff --git a/src/test/scala/org/nlogo/models/VersionTests.scala b/src/test/scala/org/nlogo/models/VersionTests.scala
index 97e8459d2..7bd10f5c5 100644
--- a/src/test/scala/org/nlogo/models/VersionTests.scala
+++ b/src/test/scala/org/nlogo/models/VersionTests.scala
@@ -34,7 +34,7 @@ class VersionTests extends TestModels {
   }
 
   val acceptedVersions =
-    Set("6.3.0")
+    Set("6.3.0", "6.4.0-beta1")
       .map { "NetLogo " + (if (Version.is3D) "3D " else "") + _ }
   testModels("Version should be one of " + acceptedVersions.mkString(", ")) {
     Option(_).map(_.version.trim).filterNot(acceptedVersions.contains)