diff --git a/demangle/Demangler.cpp b/demangle/Demangler.cpp
index 7a3aa8176..7bae3564d 100644
--- a/demangle/Demangler.cpp
+++ b/demangle/Demangler.cpp
@@ -15,6 +15,7 @@
  */
 
 #include <assert.h>
+#include <string.h>
 
 #include <cctype>
 #include <stack>