diff --git a/lib/CodeGen/CGDebugInfo.cpp b/lib/CodeGen/CGDebugInfo.cpp
index ddb8a838875a7c334149093a77a390e33b47a9d4..7ccea08901efc105a7a542962257e5ee79b44c92 100644
--- a/lib/CodeGen/CGDebugInfo.cpp
+++ b/lib/CodeGen/CGDebugInfo.cpp
@@ -1193,11 +1193,18 @@ CollectCXXBases(const CXXRecordDecl *RD, llvm::DIFile Unit,
       cast<CXXRecordDecl>(BI.getType()->getAs<RecordType>()->getDecl());
 
     if (BI.isVirtual()) {
-      // virtual base offset offset is -ve. The code generator emits dwarf
-      // expression where it expects +ve number.
-      BaseOffset =
-        0 - CGM.getItaniumVTableContext()
-               .getVirtualBaseOffsetOffset(RD, Base).getQuantity();
+      if (CGM.getTarget().getCXXABI().isItaniumFamily()) {
+        // virtual base offset offset is -ve. The code generator emits dwarf
+        // expression where it expects +ve number.
+        BaseOffset =
+          0 - CGM.getItaniumVTableContext()
+                 .getVirtualBaseOffsetOffset(RD, Base).getQuantity();
+      } else {
+        // In the MS ABI, store the vbtable offset, which is analogous to the
+        // vbase offset offset in Itanium.
+        BaseOffset =
+            4 * CGM.getMicrosoftVTableContext().getVBTableIndex(RD, Base);
+      }
       BFlags = llvm::DIDescriptor::FlagVirtual;
     } else
       BaseOffset = CGM.getContext().toBits(RL.getBaseClassOffset(Base));
diff --git a/test/CodeGenCXX/debug-info.cpp b/test/CodeGenCXX/debug-info.cpp
index 7c89dfc04ce1bcdf3fcf3ae8bf32dfcff82faa8d..b8446bedbf33863e5ac182c91019a36f5a533c22 100644
--- a/test/CodeGenCXX/debug-info.cpp
+++ b/test/CodeGenCXX/debug-info.cpp
@@ -1,4 +1,6 @@
 // RUN: %clang_cc1 -triple x86_64-none-linux-gnu -emit-llvm -g %s -o - | FileCheck %s
+// RUN: %clang_cc1 -triple i686-pc-windows-msvc -emit-llvm -g %s -o - | FileCheck %s --check-prefix=MSVC
+
 template<typename T> struct Identity {
   typedef T Type;
 };
@@ -43,14 +45,25 @@ namespace VirtualDtor {
 }
 
 namespace VirtualBase {
-  struct A { };
-  struct B : virtual A { };
+  struct A { int a; };
+  struct B : virtual A { int b; };
 
   void f() {
     B b;
   }
 }
 
+// MSVC: [[VBASE_B:![0-9]+]] = metadata !{i32 {{.*}}, metadata !"B", i32 {{[0-9]*}}, i64 96, i64 32, i32 0, i32 0, null, metadata [[VBASE_B_DEF:![0-9]+]], i32 0, {{.*}}} ; [ DW_TAG_structure_type ] [B] [line 49, size 96, align 32, offset 0] [def] [from ]
+// MSVC: [[VBASE_B_DEF]] = metadata !{metadata [[VBASE_A_IN_B:![0-9]+]],
+//
+// Look for the vbtable offset of A, which should be 4.
+// MSVC: [[VBASE_A_IN_B]] = metadata !{i32 786460, null, metadata [[VBASE_B]], null, i32 0, i64 0, i64 0, i64 4, i32 32, metadata !{{[0-9]*}}} ; [ DW_TAG_inheritance ] [line 0, size 0, align 0, offset 4] [from A]
+
+// CHECK: metadata !{{{.*}}, metadata !"B", i32 {{[0-9]*}}, i64 128, i64 64, i32 0, i32 0, null, metadata [[VBASE_B_DEF:![0-9]+]], i32 0, {{.*}}} ; [ DW_TAG_structure_type ] [B] [line 49, size 128, align 64, offset 0] [def] [from ]
+// CHECK: [[VBASE_B_DEF]] = metadata !{metadata [[VBASE_A_IN_B:![0-9]+]],
+//
+// Look for the vtable offset offset, which should be -24.
+// CHECK: [[VBASE_A_IN_B]] = metadata !{i32 786460, null, metadata !"_ZTSN11VirtualBase1BE", null, i32 0, i64 0, i64 0, i64 24, i32 32, metadata !"_ZTSN11VirtualBase1AE"} ; [ DW_TAG_inheritance ] [line 0, size 0, align 0, offset 24] [from _ZTSN11VirtualBase1AE]
 namespace b5249287 {
 template <typename T> class A {
   struct B;