diff --git a/uncore/chisel-dependent.sbt b/uncore/chisel-dependent.sbt
index eeb52c04..88eb615c 100644
--- a/uncore/chisel-dependent.sbt
+++ b/uncore/chisel-dependent.sbt
@@ -1,6 +1,8 @@
 // Provide a managed dependency on chisel if -DchiselVersion="" is
 // supplied on the command line.
 
-lazy val chiselVersion = System.getProperty("chiselVersion", "None")
+val chiselVersion_u = System.getProperty("chiselVersion", "None")
 
-libraryDependencies ++= ( if (chiselVersion != "None" ) ("edu.berkeley.cs" %% "chisel" % chiselVersion) :: Nil; else Nil)
+// _u a temporary fix until sbt 13.6 https://github.com/sbt/sbt/issues/1465
+
+libraryDependencies ++= ( if (chiselVersion_u != "None" ) ("edu.berkeley.cs" %% "chisel" % chiselVersion_u) :: Nil; else Nil)