diff --git a/cryptography/hazmat/bindings/openssl/x509.py b/cryptography/hazmat/bindings/openssl/x509.py
index 3785cc6..cf38df3 100644
--- a/cryptography/hazmat/bindings/openssl/x509.py
+++ b/cryptography/hazmat/bindings/openssl/x509.py
@@ -24,11 +24,13 @@
  * Note that the result is an opaque type.
  */
 typedef STACK_OF(X509) Cryptography_STACK_OF_X509;
+typedef STACK_OF(X509_CRL) Cryptography_STACK_OF_X509_CRL;
 typedef STACK_OF(X509_REVOKED) Cryptography_STACK_OF_X509_REVOKED;
 """
 
 TYPES = """
 typedef ... Cryptography_STACK_OF_X509;
+typedef ... Cryptography_STACK_OF_X509_CRL;
 typedef ... Cryptography_STACK_OF_X509_REVOKED;
 
 typedef struct {