diff --git a/trusty/utils/acvp/acvp_ipc.h b/trusty/utils/acvp/acvp_ipc.h
index 8b48ae3..300e05a 100644
--- a/trusty/utils/acvp/acvp_ipc.h
+++ b/trusty/utils/acvp/acvp_ipc.h
@@ -27,7 +27,7 @@
 /*
  * Maximum number of arguments
  */
-#define ACVP_MAX_NUM_ARGUMENTS 8
+#define ACVP_MAX_NUM_ARGUMENTS 9
 
 /*
  * Maximum length of an algorithm name