diff --git a/x11-clocks/cairo-clock/Makefile b/x11-clocks/cairo-clock/Makefile
index 2f8e65b3df23..345334d7c184 100644
--- a/x11-clocks/cairo-clock/Makefile
+++ b/x11-clocks/cairo-clock/Makefile
@@ -1,27 +1,29 @@
 PORTNAME=	cairo-clock
 DISTVERSION=	0.3.4
 PORTREVISION=	4
 CATEGORIES=	x11-clocks
 MASTER_SITES=	http://ftp.de.debian.org/debian/pool/main/c/cairo-clock/
 DISTNAME=	${PORTNAME}_${DISTVERSION}.orig
 
 MAINTAINER=	yuri@FreeBSD.org
 COMMENT=	Analog clock displaying the system-time
 WWW=		https://launchpad.net/cairo-clock
 
 LICENSE=	GPLv2
 LICENSE_FILE=	${WRKSRC}/COPYING
 
 BUILD_DEPENDS=	p5-XML-Parser>0:textproc/p5-XML-Parser
 LIB_DEPENDS=	libfontconfig.so:x11-fonts/fontconfig \
 		libfreetype.so:print/freetype2
 
 USES=		gettext gmake gnome iconv perl5 pkgconfig
 GNU_CONFIGURE=	yes
 USE_GNOME=	atk cairo gdkpixbuf glib20 gtk20 libglade2 pango librsvg2 libxml2
 
 WRKSRC=		${WRKDIR}/${PORTNAME}-${PORTVERSION}
 
+LDFLAGS+=	-lm
+
 MAKE_ARGS=	GMSGFMT=msgfmt DATADIRNAME=share
 
 .include <bsd.port.mk>