1 files changed, 5 insertions, 4 deletions
diff --git a/chiselFrontend/src/main/scala/chisel3/core/Data.scala b/chiselFrontend/src/main/scala/chisel3/core/Data.scala
index 74e41895..66f16294 100644
--- a/chiselFrontend/src/main/scala/chisel3/core/Data.scala
+++ b/chiselFrontend/src/main/scala/chisel3/core/Data.scala
@@ -202,10 +202,11 @@ abstract class Data extends HasId {
     * DO NOT USE OUTSIDE THIS PURPOSE. THIS OPERATION IS DANGEROUS!
     */
   private[core] def _assignCompatibilityExplicitDirection: Unit = {
-    _userDirection match {
-      case UserDirection.Unspecified => _userDirection = UserDirection.Output
-      case UserDirection.Flip => _userDirection = UserDirection.Input
-      case UserDirection.Input | UserDirection.Output => // nothing to do
+    (this, _userDirection) match {
+      case (_: Analog, _) => // nothing to do
+      case (_, UserDirection.Unspecified) => _userDirection = UserDirection.Output
+      case (_, UserDirection.Flip) => _userDirection = UserDirection.Input
+      case (_, UserDirection.Input | UserDirection.Output) => // nothing to do
     }
   }