diff --git a/tools/expat/Makefile b/tools/expat/Makefile
index 82d0fb14f9..fc339f818a 100644
--- a/tools/expat/Makefile
+++ b/tools/expat/Makefile
@@ -26,7 +26,7 @@ CMAKE_HOST_OPTIONS += \
 	-DEXPAT_BUILD_DOCS=OFF \
 	-DEXPAT_WITH_LIBBSD=OFF \
 	-DEXPAT_ENABLE_INSTALL=ON \
-	-DEXPAT_DTD=OFF \
+	-DEXPAT_DTD=ON \
 	-DEXPAT_NS=OFF \
 	-DEXPAT_DEV_URANDOM=OFF