diff --git a/src/cc/cclib.cpp b/src/cc/cclib.cpp
index da8829de6..9f66e7022 100644
--- a/src/cc/cclib.cpp
+++ b/src/cc/cclib.cpp
@@ -608,6 +608,8 @@ struct secp256k1_context_struct {
     secp256k1_callback error_callback;
 };
 
+typedef int (secp256k1_ecmult_multi_callback)(secp256k1_scalar *sc, secp256k1_ge *pt, size_t idx, void *data);
+
 int secp256k1_nonce_function_bipschnorr(unsigned char *nonce32, const unsigned char *msg32, const unsigned char *key32, const unsigned char *algo16, void *data, unsigned int counter);
 int secp256k1_pubkey_load(const secp256k1_context* ctx, secp256k1_ge* ge, const secp256k1_pubkey* pubkey);
 void secp256k1_scalar_chacha20(secp256k1_scalar *r1, secp256k1_scalar *r2, const unsigned char *seed, uint64_t idx);