diff --git a/lib/Debugger/Debugger.cpp b/lib/Debugger/Debugger.cpp
index 78f48f6..b12d90a 100644
--- a/lib/Debugger/Debugger.cpp
+++ b/lib/Debugger/Debugger.cpp
@@ -18,6 +18,7 @@
 #include "llvm/Debugger/InferiorProcess.h"
 #include "llvm/Support/MemoryBuffer.h"
 #include "llvm/ADT/StringExtras.h"
+#include <cstdlib>
 #include <memory>
 using namespace llvm;