diff --git a/services/std_svc/rmmd/rmmd_private.h b/services/std_svc/rmmd/rmmd_private.h
index d7ef4e1..73df2b8 100644
--- a/services/std_svc/rmmd/rmmd_private.h
+++ b/services/std_svc/rmmd/rmmd_private.h
@@ -54,6 +54,8 @@
 /* Functions implementing attestation utilities for RMM */
 int rmmd_attest_get_platform_token(uint64_t buf_pa, uint64_t *buf_len,
 				   uint64_t challenge_hash_len);
+int rmmd_attest_get_signing_key(uint64_t buf_pa, uint64_t *buf_len,
+				   uint64_t ecc_curve);
 
 /* Assembly helpers */
 uint64_t rmmd_rmm_enter(uint64_t *c_rt_ctx);