diff --git a/compiler-rt/lib/sanitizer_common/sanitizer_symbolizer_win.cpp b/compiler-rt/lib/sanitizer_common/sanitizer_symbolizer_win.cpp
--- a/compiler-rt/lib/sanitizer_common/sanitizer_symbolizer_win.cpp
+++ b/compiler-rt/lib/sanitizer_common/sanitizer_symbolizer_win.cpp
@@ -231,8 +231,6 @@
     // Check that tool command lines are simple and that complete escaping is
     // unnecessary.
     CHECK(!internal_strchr(arg, '"') && "quotes in args unsupported");
-    CHECK(!internal_strstr(arg, "\\\\") &&
-          "double backslashes in args unsupported");
     CHECK(arglen > 0 && arg[arglen - 1] != '\\' &&
           "args ending in backslash and empty args unsupported");
     command_line.append("\"%s\" ", arg);
diff --git a/compiler-rt/test/asan/TestCases/Windows/report_after_syminitialize.cpp b/compiler-rt/test/asan/TestCases/Windows/report_after_syminitialize.cpp
--- a/compiler-rt/test/asan/TestCases/Windows/report_after_syminitialize.cpp
+++ b/compiler-rt/test/asan/TestCases/Windows/report_after_syminitialize.cpp
@@ -1,5 +1,5 @@
 // RUN: %clangxx_asan -O0 %s -o %t
-// RUN: %env_asan_opts=external_symbolizer_path=asdf not %run %t 2>&1 | FileCheck %s
+// RUN: %env_asan_opts=external_symbolizer_path=non-existent\\\\asdf not %run %t 2>&1 | FileCheck %s
 
 #include <windows.h>
 #include <dbghelp.h>