diff --git a/src/event/ngx_event_openssl.c b/src/event/ngx_event_openssl.c
index 1f57ccb..0527c9c 100644
--- a/src/event/ngx_event_openssl.c
+++ b/src/event/ngx_event_openssl.c
@@ -560,7 +560,7 @@
 #if (NGX_DEBUG)
         {
         char         buf[129], *s, *d;
-#if OPENSSL_VERSION_NUMBER >= 0x1000000fL
+#if OPENSSL_VERSION_NUMBER >= 0x10000000L
         const
 #endif
         SSL_CIPHER  *cipher;