diff --git a/lib/Transforms/Utils/Local.cpp b/lib/Transforms/Utils/Local.cpp
index 6a1688a4254..64cd1037a98 100644
--- a/lib/Transforms/Utils/Local.cpp
+++ b/lib/Transforms/Utils/Local.cpp
@@ -15,6 +15,7 @@
 #include "llvm/Transforms/Utils/Local.h"
 #include "llvm/Constants.h"
 #include "llvm/Instructions.h"
+#include <cerrno>
 #include <cmath>
 using namespace llvm;
 
diff --git a/tools/llvm-nm/llvm-nm.cpp b/tools/llvm-nm/llvm-nm.cpp
index c5930e93728..6aaf7d2f74b 100644
--- a/tools/llvm-nm/llvm-nm.cpp
+++ b/tools/llvm-nm/llvm-nm.cpp
@@ -22,6 +22,7 @@
 #include "Support/FileUtilities.h"
 #include "Support/Signals.h"
 #include <cctype>
+#include <cerrno>
 #include <cstring>
 
 using namespace llvm;