diff --git a/imageio/imageio-metadata/src/main/java/com/twelvemonkeys/imageio/metadata/jpeg/JPEGSegmentUtil.java b/imageio/imageio-metadata/src/main/java/com/twelvemonkeys/imageio/metadata/jpeg/JPEGSegmentUtil.java
index 98a8f548..818716f5 100644
--- a/imageio/imageio-metadata/src/main/java/com/twelvemonkeys/imageio/metadata/jpeg/JPEGSegmentUtil.java
+++ b/imageio/imageio-metadata/src/main/java/com/twelvemonkeys/imageio/metadata/jpeg/JPEGSegmentUtil.java
@@ -197,7 +197,7 @@ public final class JPEGSegmentUtil {
 
         @Override
         public boolean contains(Object o) {
-            return o instanceof String;
+            return true;
         }
     }
 
@@ -209,13 +209,13 @@ public final class JPEGSegmentUtil {
 
         @Override
         public List<String> get(Object key) {
-            return containsKey(key) && JPEGSegment.isAppSegmentMarker((Integer) key) ? ALL_IDS : null;
+            return key instanceof Integer && JPEGSegment.isAppSegmentMarker((Integer) key) ? ALL_IDS : null;
 
         }
 
         @Override
         public boolean containsKey(Object key) {
-            return key instanceof Integer;
+            return true;
         }
     }