diff --git a/lib/Support/ErrorHandling.cpp b/lib/Support/ErrorHandling.cpp
index c4d5ea4c3db..08830dc80b0 100644
--- a/lib/Support/ErrorHandling.cpp
+++ b/lib/Support/ErrorHandling.cpp
@@ -19,6 +19,7 @@
 #include "llvm/System/Signals.h"
 #include "llvm/System/Threading.h"
 #include "llvm/ADT/SmallVector.h"
+#include "llvm/Config/config.h"
 #include <cassert>
 #include <cstdlib>