diff --git a/apps/lib/http_server.c b/apps/lib/http_server.c
index 6db11f4..2b5c9f5 100644
--- a/apps/lib/http_server.c
+++ b/apps/lib/http_server.c
@@ -17,6 +17,7 @@
 # define _POSIX_C_SOURCE 2
 #endif
 
+#include <string.h>
 #include <ctype.h>
 #include "http_server.h"
 #include "internal/sockets.h"