diff --git a/src/crypto/crypto-ops.h b/src/crypto/crypto-ops.h
index e01735dd..73d316f7 100644
--- a/src/crypto/crypto-ops.h
+++ b/src/crypto/crypto-ops.h
@@ -105,6 +105,7 @@ void ge_scalarmult_p3(ge_p3 *, const unsigned char *, const ge_p3 *);
 void ge_double_scalarmult_precomp_vartime(ge_p2 *, const unsigned char *, const ge_p3 *, const unsigned char *, const ge_dsmp);
 void ge_mul8(ge_p1p1 *, const ge_p2 *);
 void ge_fromfe_frombytes_vartime(ge_p2 *, const unsigned char *);
+void ge_p2_to_p3(ge_p3 *r, const ge_p2 *t);
 void ge_bytes_hash_to_ec(ge_p3 *, const unsigned char *);
 
 void ge_p3_0(ge_p3 *h);