diff --git a/simgear/io/HTTPContentDecode.cxx b/simgear/io/HTTPContentDecode.cxx
index 3a6af96e..86a0db9c 100644
--- a/simgear/io/HTTPContentDecode.cxx
+++ b/simgear/io/HTTPContentDecode.cxx
@@ -22,6 +22,7 @@
 #include <cassert>
 #include <cstdlib> // rand()
 #include <iostream>
+#include <cstring> // for memset, memcpy
 
 #include <simgear/debug/logstream.hxx>
 #include <simgear/structure/exception.hxx>