diff --git a/games/bloboats/Makefile b/games/bloboats/Makefile
index a03cc2bcd78d..f1d35d0796a3 100644
--- a/games/bloboats/Makefile
+++ b/games/bloboats/Makefile
@@ -25,4 +25,7 @@ USE_GCC=	3.4+
 
 MAKE_ENV+=	CXX="${CXX}" DATADIR="${DATADIR}"
 
+post-patch:
+	@${REINPLACE_CMD} -e 's|/usr/X11R6|${X11BASE}|g' ${WRKSRC}/Makefile
+
 .include <bsd.port.mk>