diff --git a/lldb/source/Utility/ARM_DWARF_Registers.cpp b/lldb/source/Utility/ARM_DWARF_Registers.cpp
index 384171eea084..b8737ae28518 100644
--- a/lldb/source/Utility/ARM_DWARF_Registers.cpp
+++ b/lldb/source/Utility/ARM_DWARF_Registers.cpp
@@ -8,6 +8,7 @@
 //===----------------------------------------------------------------------===//
 
 #include "ARM_DWARF_Registers.h"
+#include <string.h>
 
 using namespace lldb;
 using namespace lldb_private;