diff --git a/src/libsodium/include/sodium/private/implementations.h b/src/libsodium/include/sodium/private/implementations.h
index edbb2b8b..8426b633 100644
--- a/src/libsodium/include/sodium/private/implementations.h
+++ b/src/libsodium/include/sodium/private/implementations.h
@@ -9,5 +9,6 @@ int _crypto_stream_chacha20_pick_best_implementation(void);
 int _crypto_stream_salsa20_pick_best_implementation(void);
 int _crypto_aead_aegis128l_pick_best_implementation(void);
 int _crypto_aead_aegis256_pick_best_implementation(void);
+int _crypto_ipcrypt_pick_best_implementation(void);
 
 #endif