diff --git a/applications/jpip/opj_server/query_parser.c b/applications/jpip/opj_server/query_parser.c
index f09a6e5e..a29c8f12 100644
--- a/applications/jpip/opj_server/query_parser.c
+++ b/applications/jpip/opj_server/query_parser.c
@@ -39,6 +39,7 @@
 
 #include <stdio.h>
 #include <string.h>
+#include <stdlib.h>
 #include "query_parser.h"
 
 #ifdef SERVER