diff --git a/org.eclipse.jgit.http.server/src/org/eclipse/jgit/http/server/glue/MetaFilter.java b/org.eclipse.jgit.http.server/src/org/eclipse/jgit/http/server/glue/MetaFilter.java
index e586888bb..f53c8aecb 100644
--- a/org.eclipse.jgit.http.server/src/org/eclipse/jgit/http/server/glue/MetaFilter.java
+++ b/org.eclipse.jgit.http.server/src/org/eclipse/jgit/http/server/glue/MetaFilter.java
@@ -124,7 +124,7 @@ public boolean add(Object o) {
 
 			@Override
 			public boolean contains(Object o) {
-				return m.keySet().contains(o);
+				return m.containsKey(o);
 			}
 
 			@Override