diff --git a/lib/Dialect/FIRRTL/Transforms/LowerClasses.cpp b/lib/Dialect/FIRRTL/Transforms/LowerClasses.cpp
index ad66f37aed4..a4d848eaae8 100644
--- a/lib/Dialect/FIRRTL/Transforms/LowerClasses.cpp
+++ b/lib/Dialect/FIRRTL/Transforms/LowerClasses.cpp
@@ -760,7 +760,7 @@ updateInstanceInClass(InstanceOp firrtlInstance, hw::HierPathOp hierPath,
     // Value as an actual parameter to the Object instance.
     auto propertyAssignment = getPropertyAssignment(propertyResult);
     assert(propertyAssignment && "properties require single assignment");
-    actualParameters.push_back(propertyAssignment.getSrc());
+    actualParameters.push_back(propertyAssignment.getSrcMutable().get());
 
     // Erase the property assignment.
     opsToErase.push_back(propertyAssignment);
diff --git a/test/Dialect/FIRRTL/lower-classes.mlir b/test/Dialect/FIRRTL/lower-classes.mlir
index 678b6b61928..d7332a3a3ca 100644
--- a/test/Dialect/FIRRTL/lower-classes.mlir
+++ b/test/Dialect/FIRRTL/lower-classes.mlir
@@ -341,3 +341,19 @@ firrtl.circuit "ModuleWithPropertySubmodule" {
   firrtl.module private @SubmoduleWithProperty(in %prop: !firrtl.integer) {
   }
 }
+
+// CHECK-LABEL: firrtl.circuit "DownwardReferences"
+firrtl.circuit "DownwardReferences" {
+  firrtl.class @MyClass() {
+  }
+  firrtl.module @MyClassUser(in %myClassIn: !firrtl.class<@MyClass()>) {
+  }
+  firrtl.module @DownwardReferences() {
+    // CHECK: [[OBJ:%.+]] = om.object @MyClass
+    %myClass = firrtl.object @MyClass()
+    // CHECK: [[BP:%.+]] = om.basepath_create
+    // CHECK: om.object @MyClassUser_Class([[BP]], [[OBJ]])
+    %myClassUser.myClassIn = firrtl.instance myClassUser @MyClassUser(in myClassIn: !firrtl.class<@MyClass()>)
+    firrtl.propassign %myClassUser.myClassIn, %myClass : !firrtl.class<@MyClass()>
+  }
+}