Index: lib/IR/AsmWriter.cpp
===================================================================
--- lib/IR/AsmWriter.cpp
+++ lib/IR/AsmWriter.cpp
@@ -2618,8 +2618,9 @@
   unsigned i = 0;
   for (auto &ModPair : moduleVec) {
     Out << "^" << i++ << " = module: (";
-    Out << "path: \"" << ModPair.first << "\"";
-    Out << ", hash: (";
+    Out << "path: \"";
+    printEscapedString(ModPair.first, Out);
+    Out << "\", hash: (";
     FieldSeparator FS;
     for (auto Hash : ModPair.second)
       Out << FS << Hash;
Index: test/Assembler/asm-path-writer.ll
===================================================================
--- /dev/null
+++ test/Assembler/asm-path-writer.ll
@@ -0,0 +1,30 @@
+; REQUIRES: system-windows
+; RUN: mkdir -p %t.dir\f4folder
+; RUN: opt -module-summary %s -o %t.dir\f4folder\thinlto-alias.tmp.o
+; RUN: opt -module-summary %p\..\BitCode\Inputs\thinlto-alias.ll -o %t.dir\f4folder\thinlto-alias.tmp2.o
+; RUN: llvm-lto -thinlto -o %t.dir\f4folder\thinlto-alias %t.dir\f4folder\thinlto-alias.tmp.o %t.dir\f4folder\thinlto-alias.tmp2.o
+; RUN: llvm-dis  %t.dir\f4folder\thinlto-alias.thinlto.bc -o %t.dir\f4folder\thinlto-alias.thinlto.dis
+; RUN: llvm-as %t.dir\f4folder\thinlto-alias.thinlto.dis
+
+; ModuleID = 'thinlto-function-summary-callgraph.ll'
+target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
+target triple = "x86_64-unknown-linux-gnu"
+
+; Function Attrs: nounwind uwtable
+define i32 @main() {
+entry:
+    call void (...) @analias()
+    ret i32 0
+}
+
+declare void @analias(...)
+
+; DIS: ^0 = module: (path: "{{.*}}", hash: (0, 0, 0, 0, 0))
+; DIS: ^1 = gv: (name: "analias", summaries: (alias: (module: ^0, flags: (linkage: external, notEligibleToImport: 0, live: 0, dsoLocal: 0), aliasee: ^2))) ; guid = 12695095382722328222
+; DIS: ^2 = gv: (name: "aliasee", summaries: (function: (module: ^0, flags: (linkage: external, notEligibleToImport: 0, live: 0, dsoLocal: 0), insts: 1))) ; guid = 17407585008595848568
+
+; COMBINED-DIS: ^0 = module: (path: "{{.*}}thinlto-alias.ll.tmp.o", hash: (0, 0, 0, 0, 0))
+; COMBINED-DIS: ^1 = module: (path: "{{.*}}thinlto-alias.ll.tmp2.o", hash: (0, 0, 0, 0, 0))
+; COMBINED-DIS: ^2 = gv: (guid: 12695095382722328222, summaries: (alias: (module: ^1, flags: (linkage: external, notEligibleToImport: 0, live: 0, dsoLocal: 0), aliasee: ^4)))
+; COMBINED-DIS: ^3 = gv: (guid: 15822663052811949562, summaries: (function: (module: ^0, flags: (linkage: external, notEligibleToImport: 0, live: 0, dsoLocal: 0), insts: 2, calls: ((callee: ^2)))))
+; COMBINED-DIS: ^4 = gv: (guid: 17407585008595848568, summaries: (function: (module: ^1, flags: (linkage: external, notEligibleToImport: 0, live: 0, dsoLocal: 0), insts: 1)))