diff --git a/security/passivedns/Makefile b/security/passivedns/Makefile
index 9dd90d7276ad..7d70549360c5 100644
--- a/security/passivedns/Makefile
+++ b/security/passivedns/Makefile
@@ -26,6 +26,13 @@ CONFIGURE_ARGS=	--with-ldns-includes=${LOCALBASE}/include \
 
 USE_RC_SUBR=	passivedns
 
+OPTIONS_DEFINE=	JSON
+OPTIONS_DEFAULT=	JSON
+
+JSON_DESC=	Enable JSON log format support
+JSON_CONFIGURE_ENABLE=	json
+JSON_LIB_DEPENDS=	libjansson.so:devel/jansson
+
 do-install:
 	${INSTALL_PROGRAM} ${WRKSRC}/src/passivedns \
 		${STAGEDIR}${PREFIX}/bin