diff --git a/RSA.xs b/RSA.xs
index 6ff3a0d..35a41e1 100644
--- a/RSA.xs
+++ b/RSA.xs
@@ -12,9 +12,11 @@
 #include <openssl/ripemd.h>
 #if OPENSSL_VERSION_NUMBER >= 0x10000000 && OPENSSL_VERSION_NUMBER < 0x30000000
 #ifndef LIBRESSL_VERSION_NUMBER
+#ifndef OPENSSL_NO_WHIRLPOOL
 #include <openssl/whrlpool.h>
 #endif
 #endif
+#endif
 #include <openssl/rsa.h>
 #include <openssl/sha.h>
 #include <openssl/ssl.h>