diff --git a/cad/openscad/Makefile b/cad/openscad/Makefile
index f0ab2ecc138..66f0e09ae9e 100644
--- a/cad/openscad/Makefile
+++ b/cad/openscad/Makefile
@@ -1,11 +1,11 @@
-# $OpenBSD: Makefile,v 1.36 2020/03/13 16:54:08 rsadowski Exp $
+# $OpenBSD: Makefile,v 1.37 2020/03/15 19:57:19 rsadowski Exp $
 
 COMMENT =		the programmer's solid 3D CAD modeller#'
 BROKEN-sparc64=	SIGILL on src/cgalutils.cc with CGAL-4.6.3
 
 V =			2019.05
 DISTNAME =		openscad-${V}
-REVISION =		3
+REVISION =		4
 
 CATEGORIES =		cad
 
@@ -17,7 +17,7 @@ PERMIT_PACKAGE =	Yes
 WANTLIB += ${COMPILER_LIBCXX} CGAL GL GLEW GLU Qt5Concurrent Qt5Core
 WANTLIB += Qt5DBus Qt5Gui Qt5Multimedia Qt5Network Qt5PrintSupport
 WANTLIB += Qt5Widgets X11 boost_filesystem-mt boost_program_options-mt
-WANTLIB += boost_regex-mt boost_system-mt boost_thread-mt c
+WANTLIB += boost_regex-mt boost_system-mt boost_thread-mt c double-conversion
 WANTLIB += fontconfig freetype glib-2.0 gmp harfbuzz intl m mpfr
 WANTLIB += opencsg qscintilla2_qt5 xml2 z