diff --git a/library/cds.hana.ts b/library/cds.hana.ts
index 720c73fb..caeac72b 100644
--- a/library/cds.hana.ts
+++ b/library/cds.hana.ts
@@ -9,7 +9,7 @@ export class VARCHAR extends String {};
 export class CLOB extends String {};
 export class BINARY extends String {}
 export class ST_POINT {
-    public x: number;
-    public y: number;
+    declare public x: number;
+    declare public y: number;
 }
 export class ST_GEOMETRY { /* FIXME */ }