diff --git a/clang/lib/Driver/Driver.cpp b/clang/lib/Driver/Driver.cpp
index 35263fbe1b2d8a..e6a267621d8b4c 100644
--- a/clang/lib/Driver/Driver.cpp
+++ b/clang/lib/Driver/Driver.cpp
@@ -4601,12 +4601,12 @@ const char *Driver::GetNamedOutputPath(Compilation &C, const JobAction &JA,
   }
 
   SmallString<128> BasePath(BaseInput);
+  SmallString<128> ExternalPath("");
   StringRef BaseName;
 
   // Dsymutil actions should use the full path.
   if (isa<DsymutilJobAction>(JA) && C.getArgs().hasArg(options::OPT_dsym_dir)) {
-    SmallString<128> ExternalPath(
-        C.getArgs().getLastArg(options::OPT_dsym_dir)->getValue());
+    ExternalPath += C.getArgs().getLastArg(options::OPT_dsym_dir)->getValue();
     // We use posix style here because the tests (specifically
     // darwin-dsymutil.c) demonstrate that posix style paths are acceptable
     // even on Windows and if we don't then the similar test covering this