diff --git a/lib/SILGen/SILGenBridging.cpp b/lib/SILGen/SILGenBridging.cpp
index 26685ac79c879..aed4d9498d615 100644
--- a/lib/SILGen/SILGenBridging.cpp
+++ b/lib/SILGen/SILGenBridging.cpp
@@ -2242,13 +2242,15 @@ void SILGenFunction::emitForeignToNativeThunk(SILDeclRef thunk) {
         auto bridged = emitNativeToBridgedValue(fd, param, nativeFormalType,
                                                 foreignFormalType,
                                                 foreignLoweredTy);
-        if (foreignParam.getConvention() == ParameterConvention::Indirect_In ||
-            foreignParam.getConvention() == ParameterConvention::Indirect_In_Guaranteed) {
+        if (useLoweredAddresses() &&
+            (foreignParam.getConvention() == ParameterConvention::Indirect_In ||
+             foreignParam.getConvention() ==
+                 ParameterConvention::Indirect_In_Guaranteed)) {
           auto temp = emitTemporaryAllocation(fd, bridged.getType());
           bridged.forwardInto(*this, fd, temp);
           bridged = emitManagedBufferWithCleanup(temp);
         }
-        
+
         if (memberStatus.isInstance() && isSelf) {
           // Fill in the `self` space.
           args[memberStatus.getSelfIndex()] = bridged;
diff --git a/lib/SILGen/SILGenPoly.cpp b/lib/SILGen/SILGenPoly.cpp
index c2cff48ad0ace..6ec1119ebe88d 100644
--- a/lib/SILGen/SILGenPoly.cpp
+++ b/lib/SILGen/SILGenPoly.cpp
@@ -371,7 +371,7 @@ ManagedValue Transform::transform(ManagedValue v,
   // expect this.
   if (v.getType().isAddress()) {
     auto &inputTL = SGF.getTypeLowering(v.getType());
-    if (!inputTL.isAddressOnly()) {
+    if (!inputTL.isAddressOnly() || !SGF.silConv.useLoweredAddresses()) {
       v = emitManagedLoad(SGF, Loc, v, inputTL);
     }
   }
diff --git a/test/SILGen/Inputs/opaque_values_cxx.h b/test/SILGen/Inputs/opaque_values_cxx.h
new file mode 100644
index 0000000000000..4b357220c799d
--- /dev/null
+++ b/test/SILGen/Inputs/opaque_values_cxx.h
@@ -0,0 +1,3 @@
+#include <vector>
+
+using VectorOfU32 = std::vector<uint32_t>;
diff --git a/test/SILGen/opaque_values_cxx.swift b/test/SILGen/opaque_values_cxx.swift
new file mode 100644
index 0000000000000..9a11b56c6fc1d
--- /dev/null
+++ b/test/SILGen/opaque_values_cxx.swift
@@ -0,0 +1,26 @@
+// RUN: %target-swift-emit-silgen -enable-sil-opaque-values -Xllvm -sil-full-demangle -cxx-interoperability-mode=swift-5.9 -import-objc-header %S/Inputs/opaque_values_cxx.h -primary-file %s | %FileCheck %s --check-prefix=CHECK
+
+// TODO: Find the relevant mangled name instead of
+// $sSo3stdO3__1O0020___wrap_iter__udAAdDaVSQSCSQ2eeoiySbx_xtFZTW for other
+// platforms.
+// REQUIRES: VENDOR=apple
+
+import Cxx
+
+// CHECK-LABEL: sil {{.*}}[ossa] @$sSo3stdO{{(3__1O)?}}0042vectorUInt32allocatorUInt32_mzFHjGjjqraEeaV3Cxx0B8SequenceSCA{{.*}}P13__beginUnsafe11RawIteratorQzyFTW : {{.*}} {
+// CHECK:       bb0([[VECTOR_ADDR:%[^,]+]] :
+// CHECK:         [[VECTOR:%[^,]+]] = load_borrow [[VECTOR_ADDR]]
+// CHECK:         [[BEGIN_FN:%[^,]+]] = function_ref
+// CHECK:         [[BEGIN:%[^,]+]] = apply [[BEGIN_FN]]([[VECTOR]])
+// CHECK:         end_borrow [[VECTOR]]
+// CHECK:         return [[BEGIN]]
+// CHECK-LABEL: } // end sil function '$sSo3stdO{{(3__1O)?}}0042vectorUInt32allocatorUInt32_mzFHjGjjqraEeaV3Cxx0B8SequenceSCA{{.*}}P13__beginUnsafe11RawIteratorQzyFTW'
+// CHECK-LABEL: sil {{.*}}[ossa] @$sSo3stdO{{(3__1O)?}}0020___wrap_iter__udAAdDaVSQSCSQ2eeoiySbx_xtFZTW : {{.*}} {
+// CHECK:       bb0([[LHS:%[^,]+]] : $std.__1.__wrap_iter<_>, [[RHS:%[^,]+]] :
+// CHECK:         [[CALLEE:%[^,]+]] = function_ref @$sSo2eeoiySbSo3stdO{{(3__1O)?}}0020___wrap_iter__udAAdDaV_AGtFTO
+// CHECK:         [[EQUAL:%[^,]+]] = apply [[CALLEE]]([[LHS]], [[RHS]])
+// CHECK:         return [[EQUAL]]
+// CHECK-LABEL: } // end sil function '$sSo3stdO{{(3__1O)?}}0020___wrap_iter__udAAdDaVSQSCSQ2eeoiySbx_xtFZTW'
+func test_cxx_vector_uint32t_iterate(_ n: Int, _ vectorOfU32: VectorOfU32) {
+  for x in vectorOfU32 {}
+}