diff --git a/control/auxiliary.h b/control/auxiliary.h
index f335bb3620d77f685c6e80e8da35d502fa64c655..d3b08bb1d8df88b9a94a1684c9e7659ff33344b1 100644
--- a/control/auxiliary.h
+++ b/control/auxiliary.h
@@ -24,6 +24,7 @@
 #ifndef _chameleon_auxiliary_h_
 #define _chameleon_auxiliary_h_
 
+#include <string.h>
 #include "chameleon/struct.h"
 #include "chameleon/tasks.h"