--- a/src/ssl.c
+++ b/src/ssl.c
@@ -54,6 +54,7 @@ struct uwsc_ssl_ctx {
 #include <openssl/err.h>
 #elif UWSC_HAVE_WOLFSSL
 #define WC_NO_HARDEN
+#include <wolfssl/options.h>
 #include <wolfssl/openssl/ssl.h>
 #include <wolfssl/openssl/err.h>
 #endif
