a few missed functions in the () -> (void) migration
diff --git a/cryptography/hazmat/backends/openssl/objects.py b/cryptography/hazmat/backends/openssl/objects.py
index ad1b858..0abc42d 100644
--- a/cryptography/hazmat/backends/openssl/objects.py
+++ b/cryptography/hazmat/backends/openssl/objects.py
@@ -31,7 +31,7 @@
int OBJ_cmp(const ASN1_OBJECT *, const ASN1_OBJECT *);
ASN1_OBJECT *OBJ_dup(const ASN1_OBJECT *);
int OBJ_create(const char *, const char *, const char *);
-void OBJ_cleanup();
+void OBJ_cleanup(void);
"""
MACROS = """
diff --git a/cryptography/hazmat/backends/openssl/ssl.py b/cryptography/hazmat/backends/openssl/ssl.py
index 49b142c..fb3b17e 100644
--- a/cryptography/hazmat/backends/openssl/ssl.py
+++ b/cryptography/hazmat/backends/openssl/ssl.py
@@ -255,9 +255,9 @@
CUSTOMIZATIONS = """
#ifdef OPENSSL_NO_SSL2
static const long Cryptography_HAS_SSL2 = 0;
-SSL_METHOD* (*SSLv2_method)() = NULL;
-SSL_METHOD* (*SSLv2_client_method)() = NULL;
-SSL_METHOD* (*SSLv2_server_method)() = NULL;
+SSL_METHOD* (*SSLv2_method)(void) = NULL;
+SSL_METHOD* (*SSLv2_client_method)(void) = NULL;
+SSL_METHOD* (*SSLv2_server_method)(void) = NULL;
#else
static const long Cryptography_HAS_SSL2 = 1;
#endif