diff --git a/cryptography/hazmat/backends/openssl/ssl.py b/cryptography/hazmat/backends/openssl/ssl.py
index a2aba4d..ba4451c 100644
--- a/cryptography/hazmat/backends/openssl/ssl.py
+++ b/cryptography/hazmat/backends/openssl/ssl.py
@@ -144,8 +144,8 @@
 void SSL_set_verify_depth(SSL *, int);
 int SSL_get_verify_depth(const SSL *);
 int (*SSL_get_verify_callback(const SSL *))(int, X509_STORE_CTX *);
-void SSL_set_info_callback(SSL *, void (*)());
-void (*SSL_get_info_callback(const SSL *))();
+void SSL_set_info_callback(SSL *ssl, void (*)(const SSL *, int, int));
+void (*SSL_get_info_callback(const SSL *))(const SSL *,int, int);
 SSL *SSL_new(SSL_CTX *);
 void SSL_free(SSL *);
 int SSL_set_fd(SSL *, int);