diff --git a/include/lld/Common/LLVM.h b/include/lld/Common/LLVM.h
index f7ed1d7..34b7b0d 100644
--- a/include/lld/Common/LLVM.h
+++ b/include/lld/Common/LLVM.h
@@ -17,6 +17,7 @@
 // This should be the only #include, force #includes of all the others on
 // clients.
 #include "llvm/ADT/Hashing.h"
+#include "llvm/ADT/StringRef.h"
 #include "llvm/Support/Casting.h"
 #include <utility>
 
diff --git a/include/lld/Core/File.h b/include/lld/Core/File.h
index 492f359..df01466 100644
--- a/include/lld/Core/File.h
+++ b/include/lld/Core/File.h
@@ -16,6 +16,7 @@
 #include "llvm/ADT/Optional.h"
 #include "llvm/ADT/STLExtras.h"
 #include "llvm/ADT/Twine.h"
+#include "llvm/Support/Allocator.h"
 #include "llvm/Support/ErrorHandling.h"
 #include <functional>
 #include <memory>
diff --git a/lib/ReaderWriter/MachO/DebugInfo.h b/lib/ReaderWriter/MachO/DebugInfo.h
index 959e10f..591dd1e 100644
--- a/lib/ReaderWriter/MachO/DebugInfo.h
+++ b/lib/ReaderWriter/MachO/DebugInfo.h
@@ -12,6 +12,7 @@
 #include "lld/Core/Atom.h"
 #include <vector>
 
+#include "llvm/Support/Allocator.h"
 #include "llvm/Support/Format.h"
 #include "llvm/Support/raw_ostream.h"
 
diff --git a/tools/lld/lld.cpp b/tools/lld/lld.cpp
index 37ef260..14dcc95 100644
--- a/tools/lld/lld.cpp
+++ b/tools/lld/lld.cpp
@@ -33,6 +33,7 @@
 #include "llvm/ADT/Triple.h"
 #include "llvm/ADT/Twine.h"
 #include "llvm/Support/CommandLine.h"
+#include "llvm/Support/Host.h"
 #include "llvm/Support/InitLLVM.h"
 #include "llvm/Support/Path.h"
 #include <cstdlib>