diff --git a/games/xonix/Makefile b/games/xonix/Makefile
index 00eff9d6f47d..26dc5c0ca5b7 100644
--- a/games/xonix/Makefile
+++ b/games/xonix/Makefile
@@ -1,17 +1,18 @@
 PORTNAME=      xonix
 PORTVERSION=   1.5
 CATEGORIES=    games
 MASTER_SITES=  https://github.com/dl8dtl/xonix/archive/refs/tags/
 DISTNAME=      v${PORTVERSION}
 DIST_SUBDIR=   xonix
 
 MAINTAINER=    joerg@FreeBSD.org
 COMMENT=       Try to win land without colliding with "flyers" and "eaters"
 WWW=           https://github.com/dl8dtl/xonix
 
 LICENSE=       BSD2CLAUSE
 
 USES=          imake
+WRKSRC=        ${WRKDIR}/xonix-${PORTVERSION}
 USE_XORG=      xaw
 
 .include <bsd.port.mk>