diff --git a/src/libsodium/crypto_vrf/ietfdraft03/vrf.c b/src/libsodium/crypto_vrf/ietfdraft03/vrf.c
index c924368386..c657d7edaf 100644
--- a/src/libsodium/crypto_vrf/ietfdraft03/vrf.c
+++ b/src/libsodium/crypto_vrf/ietfdraft03/vrf.c
@@ -7,6 +7,13 @@ crypto_vrf_ietfdraft03_bytes(void)
     return crypto_vrf_ietfdraft03_BYTES;
 }
 
+// Kept for backwards compatibility
+size_t
+crypto_vrf_ietfdraft03_proofbytes(void)
+{
+    return crypto_vrf_ietfdraft03_BYTES;
+}
+
 size_t
 crypto_vrf_ietfdraft03_outputbytes(void)
 {
diff --git a/src/libsodium/include/sodium/crypto_vrf_ietfdraft03.h b/src/libsodium/include/sodium/crypto_vrf_ietfdraft03.h
index e4ad27f820..3ee55f36eb 100644
--- a/src/libsodium/include/sodium/crypto_vrf_ietfdraft03.h
+++ b/src/libsodium/include/sodium/crypto_vrf_ietfdraft03.h
@@ -16,6 +16,9 @@ extern "C" {
 SODIUM_EXPORT
 size_t crypto_vrf_ietfdraft03_bytes(void);
 
+SODIUM_EXPORT
+size_t crypto_vrf_ietfdraft03_proofbytes(void); // Kept for backwards compatibility
+
 #define crypto_vrf_ietfdraft03_OUTPUTBYTES 64U
 SODIUM_EXPORT
 size_t crypto_vrf_ietfdraft03_outputbytes(void);