diff --git a/asterixdb/asterix-om/src/main/java/org/apache/asterix/om/functions/ExternalFunctionInfo.java b/asterixdb/asterix-om/src/main/java/org/apache/asterix/om/functions/ExternalFunctionInfo.java
index 5e74223..9f3b529 100644
--- a/asterixdb/asterix-om/src/main/java/org/apache/asterix/om/functions/ExternalFunctionInfo.java
+++ b/asterixdb/asterix-om/src/main/java/org/apache/asterix/om/functions/ExternalFunctionInfo.java
@@ -28,7 +28,7 @@
 
     private static final long serialVersionUID = 1L;
 
-    private final IResultTypeComputer rtc;
+    private final transient IResultTypeComputer rtc;
     private final List<IAType> argumentTypes;
     private final String body;
     private final String language;