diff --git a/include/openssl/base.h b/include/openssl/base.h
index 86211bc..1bba23a 100644
--- a/include/openssl/base.h
+++ b/include/openssl/base.h
@@ -303,6 +303,7 @@
 typedef struct ssl_ctx_st SSL_CTX;
 typedef struct ssl_custom_extension SSL_CUSTOM_EXTENSION;
 typedef struct ssl_method_st SSL_METHOD;
+typedef struct ssl_private_key_method_st SSL_PRIVATE_KEY_METHOD;
 typedef struct ssl_session_st SSL_SESSION;
 typedef struct ssl_st SSL;
 typedef struct st_ERR_FNS ERR_FNS;