diff --git a/inc/hf/api.h b/inc/hf/api.h
index b31d7b5..aae2298 100644
--- a/inc/hf/api.h
+++ b/inc/hf/api.h
@@ -61,6 +61,7 @@
 					    const struct ffa_uuid *uuid);
 struct ffa_value api_ffa_id_get(const struct vcpu *current);
 struct ffa_value api_ffa_spm_id_get(void);
+struct ffa_value api_ffa_feature_success(uint32_t arg2);
 struct ffa_value api_ffa_features(uint32_t function_id);
 struct ffa_value api_ffa_run(ffa_vm_id_t vm_id, ffa_vcpu_index_t vcpu_idx,
 			     struct vcpu *current, struct vcpu **next);