diff --git a/x11/tint2/Makefile b/x11/tint2/Makefile
index b3ad265b0bc4..8768c7046dad 100644
--- a/x11/tint2/Makefile
+++ b/x11/tint2/Makefile
@@ -1,4 +1,4 @@
-# $NetBSD: Makefile,v 1.60 2022/03/11 21:33:34 tnn Exp $
+# $NetBSD: Makefile,v 1.61 2022/04/12 13:47:10 tnn Exp $
 
 DISTNAME=		tint2-v17.0.2
 PKGNAME=		${DISTNAME:S/-v/-/}
@@ -24,6 +24,9 @@ CONF_FILES=		${PREFIX}/share/examples/tint2/tint2rc \
 CMAKE_ARGS.Linux=	-DENABLE_BATTERY=ON
 CMAKE_ARGS.*=		-DENABLE_BATTERY=OFF
 
+CFLAGS.SunOS+=		-D_XOPEN_SOURCE=600 -D__EXTENSIONS__
+CFLAGS.SunOS+=		-Du_int8_t=uint8_t -Du_int32_t=uint32_t -Du_int64_t=uint64_t
+
 post-install:
 	${INSTALL_DATA} ${WRKSRC}/themes/tint2rc \
 		${DESTDIR}${PREFIX}/share/examples/tint2