1 files changed, 6 insertions, 2 deletions
diff --git a/src/main/scala/firrtl/transforms/SimplifyMems.scala b/src/main/scala/firrtl/transforms/SimplifyMems.scala
index 8ecc484a..92e19f7e 100644
--- a/src/main/scala/firrtl/transforms/SimplifyMems.scala
+++ b/src/main/scala/firrtl/transforms/SimplifyMems.scala
@@ -6,6 +6,7 @@ package transforms
 import firrtl.ir._
 import firrtl.Mappers._
 import firrtl.annotations._
+import firrtl.options.Dependency
 import firrtl.passes._
 import firrtl.passes.memlib._
 import firrtl.stage.Forms
@@ -21,9 +22,12 @@ import ResolveMaskGranularity._
 class SimplifyMems extends Transform with DependencyAPIMigration {
 
   override def prerequisites = Forms.MidForm
-  override def optionalPrerequisites = Seq.empty
+  override def optionalPrerequisites = Seq(Dependency[InferReadWrite])
   override def optionalPrerequisiteOf = Forms.MidEmitters
-  override def invalidates(a: Transform) = false
+  override def invalidates(a: Transform) = a match {
+    case InferTypes => true
+    case _          => false
+  }
 
   def onModule(c: Circuit, renames: RenameMap)(m: DefModule): DefModule = {
     val moduleNS = Namespace(m)