diff --git a/openbis/source/java/ch/systemsx/cisd/openbis/generic/client/web/client/application/ui/field/ScriptField.java b/openbis/source/java/ch/systemsx/cisd/openbis/generic/client/web/client/application/ui/field/ScriptField.java
index b81193bbc68a726d4f3fdfd8059f2f8501851738..38496d9d49d38a2538f393ca828d6d19a38e74e3 100644
--- a/openbis/source/java/ch/systemsx/cisd/openbis/generic/client/web/client/application/ui/field/ScriptField.java
+++ b/openbis/source/java/ch/systemsx/cisd/openbis/generic/client/web/client/application/ui/field/ScriptField.java
@@ -32,7 +32,7 @@ import ch.systemsx.cisd.openbis.plugin.query.client.web.client.application.Dict;
 public class ScriptField extends MultilineVarcharField
 {
 
-    private final static String CALCULATE_DEFINITION = "def calculate()";
+    private final static String CALCULATE_DEFINITION = "def calculate():";
 
     private final static String CALCULATE_DEFINITION_NOT_FOUND_MSG =
             "Multiline script should contain definition of 'calculate()' function.";