diff --git a/source/net/sourceforge/filebot/format/ExpressionFormat.java b/source/net/sourceforge/filebot/format/ExpressionFormat.java
index 82841bc1..abbef917 100644
--- a/source/net/sourceforge/filebot/format/ExpressionFormat.java
+++ b/source/net/sourceforge/filebot/format/ExpressionFormat.java
@@ -3,6 +3,7 @@ package net.sourceforge.filebot.format;
 
 
 import static net.sourceforge.tuned.ExceptionUtilities.*;
+import static net.sourceforge.tuned.FileUtilities.*;
 import groovy.lang.GroovyRuntimeException;
 import groovy.lang.MissingPropertyException;
 
@@ -141,7 +142,13 @@ public class ExpressionFormat extends Format {
 	
 
 	public Bindings getBindings(Object value) {
-		return new ExpressionBindings(value);
+		return new ExpressionBindings(value) {
+			
+			@Override
+			public Object get(Object key) {
+				return normalizeBindingValue(super.get(key));
+			}
+		};
 	}
 	
 
@@ -165,7 +172,7 @@ public class ExpressionFormat extends Format {
 		for (Object snipped : compilation) {
 			if (snipped instanceof CompiledScript) {
 				try {
-					Object value = ((CompiledScript) snipped).eval(context);
+					Object value = normalizeExpressionValue(((CompiledScript) snipped).eval(context));
 					
 					if (value != null) {
 						sb.append(value);
@@ -182,6 +189,22 @@ public class ExpressionFormat extends Format {
 	}
 	
 
+	protected Object normalizeBindingValue(Object value) {
+		// if the binding value is a String, remove illegal characters
+		if (value instanceof CharSequence) {
+			return replacePathSeparators(value.toString()).trim();
+		}
+		
+		// if the binding value is an Object, just leave it
+		return value;
+	}
+	
+
+	protected Object normalizeExpressionValue(Object value) {
+		return value;
+	}
+	
+
 	protected void handleException(ScriptException exception) {
 		if (findCause(exception, MissingPropertyException.class) != null) {
 			lastException = new ExpressionException(new BindingException(findCause(exception, MissingPropertyException.class).getProperty(), "undefined", exception));
diff --git a/source/net/sourceforge/filebot/ui/rename/ExpressionFormatter.java b/source/net/sourceforge/filebot/ui/rename/ExpressionFormatter.java
index ae05c7ba..9b4f08f7 100644
--- a/source/net/sourceforge/filebot/ui/rename/ExpressionFormatter.java
+++ b/source/net/sourceforge/filebot/ui/rename/ExpressionFormatter.java
@@ -2,15 +2,11 @@
 package net.sourceforge.filebot.ui.rename;
 
 
-import static net.sourceforge.tuned.FileUtilities.*;
-
 import java.io.File;
 import java.text.Format;
 
-import javax.script.Bindings;
 import javax.script.ScriptException;
 
-import net.sourceforge.filebot.format.ExpressionBindings;
 import net.sourceforge.filebot.format.ExpressionFormat;
 import net.sourceforge.filebot.format.MediaBindingBean;
 import net.sourceforge.filebot.similarity.Match;
@@ -53,27 +49,7 @@ class ExpressionFormatter implements MatchFormatter {
 	public synchronized String format(Match<?, ?> match) throws ScriptException {
 		// lazy initialize script engine
 		if (format == null) {
-			format = new ExpressionFormat(expression) {
-				
-				@Override
-				public Bindings getBindings(Object value) {
-					return new ExpressionBindings(value) {
-						
-						@Override
-						public Object get(Object key) {
-							Object value = super.get(key);
-							
-							// if the binding value is a String, remove illegal characters
-							if (value instanceof CharSequence) {
-								return replacePathSeparators(value.toString()).trim();
-							}
-							
-							// if the binding value is an Object, just leave it
-							return value;
-						}
-					};
-				}
-			};
+			format = new ExpressionFormat(expression);
 		}
 		
 		// evaluate the expression using the given bindings