diff --git a/src/event/ngx_event_openssl.h b/src/event/ngx_event_openssl.h
index a54a86a4e..81b87d7cb 100644
--- a/src/event/ngx_event_openssl.h
+++ b/src/event/ngx_event_openssl.h
@@ -12,6 +12,8 @@
 #include <ngx_config.h>
 #include <ngx_core.h>
 
+#define OPENSSL_SUPPRESS_DEPRECATED
+
 #include <openssl/ssl.h>
 #include <openssl/err.h>
 #include <openssl/bn.h>