diff --git a/indra/llmessage/debug_libcurl.cpp b/indra/llmessage/debug_libcurl.cpp
index 3f85dcc2d..40b75d200 100644
--- a/indra/llmessage/debug_libcurl.cpp
+++ b/indra/llmessage/debug_libcurl.cpp
@@ -5,6 +5,7 @@
 #include <iomanip>
 #include <cstdlib>
 #include <stdarg.h>
+#include <cstring>
 #include "llpreprocessor.h"
 #include <curl/curl.h>
 #define COMPILING_DEBUG_LIBCURL_CC