diff --git a/cryptography/hazmat/backends/openssl/crypto.py b/cryptography/hazmat/backends/openssl/crypto.py
index 5e99502..45e265d 100644
--- a/cryptography/hazmat/backends/openssl/crypto.py
+++ b/cryptography/hazmat/backends/openssl/crypto.py
@@ -24,6 +24,9 @@
 """
 
 FUNCTIONS = """
+unsigned long SSLeay(void);
+const char *SSLeay_version(int);
+
 void CRYPTO_free(void *);
 int CRYPTO_mem_ctrl(int);
 int CRYPTO_is_mem_check_on(void);