diff --git a/converters/pdf2djvu/Makefile b/converters/pdf2djvu/Makefile
index 24f103df8294..d307401eea6d 100644
--- a/converters/pdf2djvu/Makefile
+++ b/converters/pdf2djvu/Makefile
@@ -15,9 +15,9 @@ BUILD_DEPENDS=	${LOCALBASE}/include/pstreams/pstream.h:devel/pstreams
 LIB_DEPENDS=	libdjvulibre.so:graphics/djvulibre \
 		libpoppler.so:graphics/poppler
 
-USES=		autoreconf:build compiler:c++17-lang gettext-tools \
+USES=		autoreconf:build compiler:c++20-lang gettext-tools \
 		gmake iconv localbase pkgconfig tar:xz
-USE_CXXSTD=	c++17
+USE_CXXSTD=	c++20
 
 GNU_CONFIGURE=	yes
 GNU_CONFIGURE_MANPREFIX=${PREFIX}/share