diff --git a/lib/Frontend/CompilerInvocation.cpp b/lib/Frontend/CompilerInvocation.cpp
index dd99c09..10d8f3a 100644
--- a/lib/Frontend/CompilerInvocation.cpp
+++ b/lib/Frontend/CompilerInvocation.cpp
@@ -298,7 +298,7 @@
 
 static void HeaderSearchOptsToArgs(const HeaderSearchOptions &Opts,
                                    std::vector<std::string> &Res) {
-  if (Opts.Sysroot.empty()) {
+  if (Opts.Sysroot != "/") {
     Res.push_back("-isysroot");
     Res.push_back(Opts.Sysroot);
   }