diff --git a/include/drivers/arm/tzc400.h b/include/drivers/arm/tzc400.h
index 5f8a48f..765c130 100644
--- a/include/drivers/arm/tzc400.h
+++ b/include/drivers/arm/tzc400.h
@@ -109,6 +109,7 @@
 			  unsigned long long region_top,
 			  unsigned int sec_attr,
 			  unsigned int nsaid_permissions);
+void tzc400_update_filters(unsigned int region, unsigned int filters);
 void tzc400_set_action(unsigned int action);
 void tzc400_enable_filters(void);
 void tzc400_disable_filters(void);