diff --git a/include/llvm/ADT/APInt.h b/include/llvm/ADT/APInt.h
index c6256ae8462..25505c836e4 100644
--- a/include/llvm/ADT/APInt.h
+++ b/include/llvm/ADT/APInt.h
@@ -21,7 +21,6 @@
 #include <cstring>
 #include <iosfwd>
 #include <string>
-#include <cstring>
 
 namespace llvm {
   class Serializer;