diff --git a/src/core/document.js b/src/core/document.js
index 723c016e2..2dab34d06 100644
--- a/src/core/document.js
+++ b/src/core/document.js
@@ -1947,12 +1947,7 @@ class PDFDocument {
   }
 
   get calculationOrderIds() {
-    const acroForm = this.catalog.acroForm;
-    if (!acroForm?.has("CO")) {
-      return shadow(this, "calculationOrderIds", null);
-    }
-
-    const calculationOrder = acroForm.get("CO");
+    const calculationOrder = this.catalog.acroForm?.get("CO");
     if (!Array.isArray(calculationOrder) || calculationOrder.length === 0) {
       return shadow(this, "calculationOrderIds", null);
     }
@@ -1963,10 +1958,7 @@ class PDFDocument {
         ids.push(id.toString());
       }
     }
-    if (ids.length === 0) {
-      return shadow(this, "calculationOrderIds", null);
-    }
-    return shadow(this, "calculationOrderIds", ids);
+    return shadow(this, "calculationOrderIds", ids.length ? ids : null);
   }
 
   get annotationGlobals() {