diff --git a/include/openssl/base58.h b/include/openssl/base58.h
index b111e8c3..f1919eb2 100644
--- a/include/openssl/base58.h
+++ b/include/openssl/base58.h
@@ -58,8 +58,8 @@ extern "C" {
 #endif
 
 
-bool base58_decode(const char *b58, size_t b58sz, void *bin, size_t *binszp);
-bool base58_encode(const void *data, size_t binsz, char *b58, size_t *b58sz);
+int base58_decode(const char *b58, size_t b58sz, void *bin, size_t *binszp);
+int base58_encode(const void *data, size_t binsz, char *b58, size_t *b58sz);
 
 /* BEGIN ERROR CODES */
 /*