diff --git a/llvm/lib/Fuzzer/FuzzerIO.cpp b/llvm/lib/Fuzzer/FuzzerIO.cpp
index b6ffb75..4bb2df5 100644
--- a/llvm/lib/Fuzzer/FuzzerIO.cpp
+++ b/llvm/lib/Fuzzer/FuzzerIO.cpp
@@ -49,6 +49,10 @@
 
 Unit FileToVector(const std::string &Path) {
   std::ifstream T(Path);
+  if (!T) {
+    Printf("No such directory: %s; exiting\n", Path.c_str());
+    exit(1);
+  }
   return Unit((std::istreambuf_iterator<char>(T)),
               std::istreambuf_iterator<char>());
 }