diff --git a/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/common/FunctionManagerImpl.java b/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/common/FunctionManagerImpl.java
index bb4526c..127d4a6 100644
--- a/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/common/FunctionManagerImpl.java
+++ b/asterix-runtime/src/main/java/edu/uci/ics/asterix/runtime/evaluators/common/FunctionManagerImpl.java
@@ -41,7 +41,7 @@
         if (factory == null) {
             throw new AlgebricksException("Inappropriate use of function " + "'" + fid.getName() + "'");
         }
-        return functions.get(key).createFunctionDescriptor();
+        return factory.createFunctionDescriptor();
     }
 
     @Override