diff --git a/db-service/lib/cqn4sql.js b/db-service/lib/cqn4sql.js
index 0799bf2c2..7d035a91d 100644
--- a/db-service/lib/cqn4sql.js
+++ b/db-service/lib/cqn4sql.js
@@ -530,7 +530,7 @@ function cqn4sql(originalQuery, model) {
       res = getTransformedTokenStream([value], baseLink)[0]
     } else if (xpr) {
       res = { xpr: getTransformedTokenStream(value.xpr, baseLink) }
-    } else if (val) {
+    } else if (val !== undefined) {
       res = { val }
     } else if (func) {
       res = { args: getTransformedFunctionArgs(value.args, baseLink), func: value.func }