diff --git a/src/modules/musig/session_impl.h b/src/modules/musig/session_impl.h
index 96b8eff1..91420731 100644
--- a/src/modules/musig/session_impl.h
+++ b/src/modules/musig/session_impl.h
@@ -554,7 +554,7 @@ int secp256k1_musig_nonce_process(const secp256k1_context* ctx, secp256k1_musig_
     return 1;
 }
 
-void secp256k1_musig_partial_sign_clear(secp256k1_scalar *sk, secp256k1_scalar *k) {
+static void secp256k1_musig_partial_sign_clear(secp256k1_scalar *sk, secp256k1_scalar *k) {
     secp256k1_scalar_clear(sk);
     secp256k1_scalar_clear(&k[0]);
     secp256k1_scalar_clear(&k[1]);