diff --git a/src/event/ngx_event_openssl.h b/src/event/ngx_event_openssl.h
index afccb52d7..3a0bbfdba 100644
--- a/src/event/ngx_event_openssl.h
+++ b/src/event/ngx_event_openssl.h
@@ -23,12 +23,14 @@
 #include <openssl/engine.h>
 #endif
 #include <openssl/evp.h>
+#if (NGX_QUIC)
 #ifdef OPENSSL_IS_BORINGSSL
 #include <openssl/hkdf.h>
 #include <openssl/chacha.h>
 #else
 #include <openssl/kdf.h>
 #endif
+#endif
 #include <openssl/hmac.h>
 #ifndef OPENSSL_NO_OCSP
 #include <openssl/ocsp.h>