diff --git a/devel/py-sure/Makefile b/devel/py-sure/Makefile
index a739d591e569..549f9d0325c4 100644
--- a/devel/py-sure/Makefile
+++ b/devel/py-sure/Makefile
@@ -1,4 +1,4 @@
-# $NetBSD: Makefile,v 1.7 2022/01/10 16:30:33 adam Exp $
+# $NetBSD: Makefile,v 1.8 2022/01/14 09:38:06 wiz Exp $
 
 DISTNAME=	sure-2.0.0
 PKGNAME=	${PYPKGPREFIX}-${DISTNAME}
@@ -17,6 +17,8 @@ USE_LANGUAGES=	# none
 
 USE_PKG_RESOURCES=	yes
 
+PYTHON_VERSIONS_INCOMPATIBLE=	27
+
 PYTHON_VERSIONED_DEPENDENCIES=	test:test
 
 post-install: