diff --git a/src/Organya.cpp b/src/Organya.cpp
index 8b4bb41c..bef4ab9b 100644
--- a/src/Organya.cpp
+++ b/src/Organya.cpp
@@ -8,6 +8,7 @@
 
 #include <stddef.h>
 #include <stdio.h>
+#include <stdlib.h>
 #include <string.h>
 
 #ifdef FIX_BUGS