diff --git a/pdfbox/src/main/java/org/apache/pdfbox/pdmodel/PDPage.java b/pdfbox/src/main/java/org/apache/pdfbox/pdmodel/PDPage.java
index 189dc62b088..19efbb0a150 100644
--- a/pdfbox/src/main/java/org/apache/pdfbox/pdmodel/PDPage.java
+++ b/pdfbox/src/main/java/org/apache/pdfbox/pdmodel/PDPage.java
@@ -866,7 +866,7 @@ public List<PDViewportDictionary> getViewports()
         {
             return null;
         }
-        List<PDViewportDictionary> viewports = new ArrayList<>();
+        List<PDViewportDictionary> viewports = new ArrayList<>(array.size());
         for (int i = 0; i < array.size(); ++i)
         {
             COSBase base2 = array.getObject(i);