diff --git a/compiler/src/dmd/expressionsem.d b/compiler/src/dmd/expressionsem.d
index 6e2aeb46eda..d457dd18bec 100644
--- a/compiler/src/dmd/expressionsem.d
+++ b/compiler/src/dmd/expressionsem.d
@@ -3288,6 +3288,7 @@ private bool functionParameters(const ref Loc loc, Scope* sc,
             else if (p.storageClass & STC.ref_)
             {
                 if (global.params.rvalueRefParam == FeatureState.enabled &&
+                    !p.storageClass & STC.return_ &&
                     !arg.isLvalue() &&
                     targ.isCopyable())
                 {   /* allow rvalues to be passed to ref parameters by copying
diff --git a/compiler/test/compilable/reverthelp.d b/compiler/test/compilable/reverthelp.d
index febbba1445a..c8dab44e1bb 100644
--- a/compiler/test/compilable/reverthelp.d
+++ b/compiler/test/compilable/reverthelp.d
@@ -9,5 +9,6 @@ Revertable language changes listed by -revert=name:
   =dip1000          revert DIP1000 changes (Scoped Pointers) (https://github.com/dlang/DIPs/blob/master/DIPs/other/DIP1000.md)
   =intpromote       revert integral promotions for unary + - ~ operators
   =dtorfields       don't destruct fields of partially constructed objects
+  =rvaluerefparam   revert rvalue arguments to ref parameters
 ----
 */
diff --git a/compiler/test/fail_compilation/fail9773.d b/compiler/test/fail_compilation/fail9773.d
deleted file mode 100644
index 26447a73914..00000000000
--- a/compiler/test/fail_compilation/fail9773.d
+++ /dev/null
@@ -1,10 +0,0 @@
-/*
-TEST_OUTPUT:
----
-fail_compilation/fail9773.d(7): Error: cannot create default argument for `ref` / `out` parameter from expression `""` because it is not an lvalue
----
-*/
-void f(ref string a = "")
-{
-    a = "crash and burn";
-}