diff --git a/db-service/lib/cqn2sql.js b/db-service/lib/cqn2sql.js
index cdf3b4959..ccb1c68a5 100644
--- a/db-service/lib/cqn2sql.js
+++ b/db-service/lib/cqn2sql.js
@@ -990,7 +990,7 @@ class CQN2SQLRenderer {
     } else {
       cds.error`Invalid arguments provided for function '${func}' (${args})`
     }
-    const fn = this.class.Functions[func]?.apply(this.class.Functions, args) || `${func}(${args})`
+    const fn = this.class.Functions[func]?.apply(this.class.Functions, args) || `${func}${args ? `(${args})`: ''}`
     if (xpr) return `${fn} ${this.xpr({ xpr })}`
     return fn
   }