diff --git a/cryptography/hazmat/backends/openssl/bio.py b/cryptography/hazmat/backends/openssl/bio.py
index 264a241..279ad22 100644
--- a/cryptography/hazmat/backends/openssl/bio.py
+++ b/cryptography/hazmat/backends/openssl/bio.py
@@ -143,10 +143,10 @@
 long BIO_get_mem_ptr(BIO *, BUF_MEM **);
 long BIO_set_fp(BIO *, FILE *, int);
 long BIO_get_fp(BIO *, FILE **);
-int BIO_read_filename(BIO *, char *);
-int BIO_write_filename(BIO *, char *);
-int BIO_append_filename(BIO *, char *);
-int BIO_rw_filename(BIO *, char *);
+long BIO_read_filename(BIO *, char *);
+long BIO_write_filename(BIO *, char *);
+long BIO_append_filename(BIO *, char *);
+long BIO_rw_filename(BIO *, char *);
 int BIO_should_read(BIO *);
 int BIO_should_write(BIO *);
 int BIO_should_io_special(BIO *);
diff --git a/cryptography/hazmat/backends/openssl/ssl.py b/cryptography/hazmat/backends/openssl/ssl.py
index fc7ccf3..2b1fb4a 100644
--- a/cryptography/hazmat/backends/openssl/ssl.py
+++ b/cryptography/hazmat/backends/openssl/ssl.py
@@ -213,7 +213,7 @@
 int SSL_want_read(const SSL *);
 int SSL_want_write(const SSL *);
 
-int SSL_total_renegotiations(SSL *);
+long SSL_total_renegotiations(SSL *);
 
 long SSL_CTX_set_options(SSL_CTX *, long);
 long SSL_CTX_get_options(SSL_CTX *);