diff --git a/graphics/heimer/Makefile b/graphics/heimer/Makefile
index 2645244debc8..2023279c06cb 100644
--- a/graphics/heimer/Makefile
+++ b/graphics/heimer/Makefile
@@ -1,36 +1,37 @@
 PORTNAME=	heimer
 DISTVERSION=	4.5.0
 CATEGORIES=	graphics
 MASTER_SITES=	https://github.com/juzzlin/Heimer/releases/download/${DISTVERSION}/
 
 MAINTAINER=	eduardo@FreeBSD.org
 COMMENT=	Simple mind map, diagram, and note-taking tool
 WWW=		https://github.com/juzzlin/Heimer
 
 LICENSE=	GPLv3
 LICENSE_FILE=	${WRKSRC}/COPYING
 
 USES=		cmake:testing gl qt:6
 USE_GL=		opengl
 USE_QT=		base svg translations
 
 CMAKE_ON=	BUILD_WITH_QT6
+CMAKE_ARGS=	-DCMAKE_POLICY_VERSION_MINIMUM=3.5
 
 PORTDOCS=	README.md
 
 OPTIONS_DEFINE=		DOCS EXAMPLES TEST
 OPTIONS_SUB=		yes
 TEST_CMAKE_BOOL=	BUILD_TESTS
 
 do-install-DOCS-on:
 	@${MKDIR} ${STAGEDIR}${DOCSDIR}
 	${INSTALL_DATA} ${WRKSRC}/${PORTDOCS} ${STAGEDIR}${DOCSDIR}
 
 do-install-EXAMPLES-on:
 	@${MKDIR} ${STAGEDIR}${EXAMPLESDIR}
 	(cd ${WRKSRC}/examples && ${COPYTREE_SHARE} . ${STAGEDIR}${EXAMPLESDIR})
 
 post-install:
 	${STRIP_CMD} ${STAGEDIR}${PREFIX}/bin/heimer
 
 .include <bsd.port.mk>