diff --git a/include/openssl/crypto.h b/include/openssl/crypto.h
index 171ac43..c5c21bb 100644
--- a/include/openssl/crypto.h
+++ b/include/openssl/crypto.h
@@ -162,6 +162,7 @@
 #define OPENSSL_INIT_NO_ADD_ALL_DIGESTS 0
 #define OPENSSL_INIT_LOAD_CONFIG 0
 #define OPENSSL_INIT_NO_LOAD_CONFIG 0
+#define OPENSSL_INIT_NO_ATEXIT 0
 
 // OPENSSL_init_crypto calls |CRYPTO_library_init| and returns one.
 OPENSSL_EXPORT int OPENSSL_init_crypto(uint64_t opts,