diff --git a/science/kalzium/Makefile b/science/kalzium/Makefile
index bb633b33e855..7a7f69efb4ba 100644
--- a/science/kalzium/Makefile
+++ b/science/kalzium/Makefile
@@ -1,37 +1,39 @@
 PORTNAME=	kalzium
 DISTVERSION=	${KDE_APPLICATIONS_VERSION}
 PORTREVISION=	1
 CATEGORIES=	science education kde kde-applications
 
 MAINTAINER=	kde@FreeBSD.org
 COMMENT=	Periodic table of elements for KDE
 WWW=		https://www.kde.org/applications/education/kalzium
 
 LICENSE=	GPLv2 LGPL20 GFDL
 LICENSE_COMB=	multi
 
 LIB_DEPENDS=	libopenbabel.so:science/openbabel \
 		libAvogadroCore.so:science/avogadrolibs
 BUILD_DEPENDS=	${LOCALBASE}/lib/ocaml/facile/facile.a:math/facile \
 		${LOCALBASE}/libdata/pkgconfig/chemical-mime-data.pc:science/chemical-mime-data
 RUN_DEPENDS=	${LOCALBASE}/libdata/pkgconfig/chemical-mime-data.pc:science/chemical-mime-data
 
 USES=		cmake compiler:c++11-lang desktop-file-utils gettext gl kde:5 \
 		ocaml:build pkgconfig qt:5 tar:xz xorg
 USE_GL=		gl glew glu
 USE_KDE=	auth archive attica bookmarks codecs completion config configwidgets \
 		coreaddons crash doctools emoticons guiaddons i18n \
 		iconthemes itemmodels itemviews jobwidgets js kdelibs4support \
 		khtml kio newstuff notifications parts plotting service solid \
 		sonnet textwidgets unitconversion widgetsaddons windowsystem \
 		xmlgui \
 		ecm:build
 USE_QT=		concurrent core dbus declarative gui network opengl printsupport script svg \
 		widgets xml \
 		buildtools:build qmake:build
 USE_XORG=	x11
 USE_LDCONFIG=	yes
 
+PIE_UNSAFE=	yes
+
 OPTIONS_DEFINE=	DOCS
 
 .include <bsd.port.mk>