diff --git a/llvm/include/llvm/Support/Casting.h b/llvm/include/llvm/Support/Casting.h
--- a/llvm/include/llvm/Support/Casting.h
+++ b/llvm/include/llvm/Support/Casting.h
@@ -355,7 +355,7 @@
   static inline CastResultType doCastIfPossible(std::unique_ptr<From> &&f) {
     if (!Self::isPossible(f.get()))
       return castFailed();
-    return doCast(std::forward<std::unique_ptr<From> &&>(f));
+    return doCast(std::forward<std::unique_ptr<From>>(f));
   }
 };
 
diff --git a/llvm/unittests/Support/Casting.cpp b/llvm/unittests/Support/Casting.cpp
--- a/llvm/unittests/Support/Casting.cpp
+++ b/llvm/unittests/Support/Casting.cpp
@@ -212,6 +212,14 @@
   // EXPECT_EQ(F4, null_foo);
   foo *F5 = B1.daz();
   EXPECT_NE(F5, null_foo);
+
+  std::unique_ptr<const bar> BP(B2);
+  auto FP = dyn_cast<foo>(std::move(BP));
+  static_assert(std::is_same_v<std::unique_ptr<const foo>, decltype(FP)>,
+                "Incorrect deduced return type!");
+  EXPECT_NE(FP.get(), null_foo);
+  EXPECT_EQ(BP.get(), nullptr);
+  FP.release();
 }
 
 // All these tests forward to dyn_cast_if_present, so they also provde an