diff --git a/test/issue820-extra-fields-after-convert.sh b/test/issue820-extra-fields-after-convert.sh
new file mode 100755
index 0000000..ec9e935
--- /dev/null
+++ b/test/issue820-extra-fields-after-convert.sh
@@ -0,0 +1,18 @@
+#!/bin/sh
+
+set -e
+
+cd ${CURR_DIR}/1-exec-simple
+
+cp dub.json dub.json.bak
+${DUB} convert -f sdl
+
+if grep -c -e "version\|sourcePaths\|importPaths\|configuration" dub.sdl > /dev/null; then
+	echo "Conversion added extra fields."
+	mv dub.json.bak dub.json
+	rm dub.sdl
+	exit 1
+fi
+
+mv dub.json.bak dub.json
+rm dub.sdl