diff --git a/crypto/threads/mttest.c b/crypto/threads/mttest.c
index eb97430fb..dbff4a69f 100644
--- a/crypto/threads/mttest.c
+++ b/crypto/threads/mttest.c
@@ -56,7 +56,6 @@
  * [including the GNU Public Licence.]
  */
 
-#include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
 #include <errno.h>