diff --git a/pdfbox/src/main/java/org/apache/pdfbox/cos/COSInputStream.java b/pdfbox/src/main/java/org/apache/pdfbox/cos/COSInputStream.java
index 0b130347631..ea34433dd6b 100644
--- a/pdfbox/src/main/java/org/apache/pdfbox/cos/COSInputStream.java
+++ b/pdfbox/src/main/java/org/apache/pdfbox/cos/COSInputStream.java
@@ -104,4 +104,11 @@ public DecodeResult getDecodeResult()
             return decodeResults.get(decodeResults.size() - 1);
         }
     }
+
+    @Override
+    public void close() throws IOException {
+        decodeResults.clear();
+
+        super.close();
+    }
 }