diff --git a/source/net/sourceforge/filebot/format/ExpressionFilter.java b/source/net/sourceforge/filebot/format/ExpressionFilter.java
index 58b4215f..1af07afd 100644
--- a/source/net/sourceforge/filebot/format/ExpressionFilter.java
+++ b/source/net/sourceforge/filebot/format/ExpressionFilter.java
@@ -1,7 +1,5 @@
-
 package net.sourceforge.filebot.format;
 
-
 import java.security.AccessController;
 
 import javax.script.Bindings;
@@ -9,71 +7,58 @@ import javax.script.Compilable;
 import javax.script.CompiledScript;
 import javax.script.ScriptContext;
 import javax.script.ScriptException;
-import javax.script.SimpleBindings;
 import javax.script.SimpleScriptContext;
 
+import org.codehaus.groovy.runtime.typehandling.DefaultTypeTransformation;
 
 public class ExpressionFilter {
-	
+
 	private final String expression;
-	
-	private final CompiledScript userScript;
-	private final CompiledScript asBooleanScript;
-	
+	private final CompiledScript compiledExpression;
+
 	private Throwable lastException;
-	
-	
+
 	public ExpressionFilter(String expression) throws ScriptException {
 		this.expression = expression;
-		
+
 		Compilable engine = (Compilable) ExpressionFormat.getGroovyScriptEngine();
-		this.userScript = new SecureCompiledScript(engine.compile(expression)); // sandboxed script
-		this.asBooleanScript = engine.compile("value as Boolean");
+		this.compiledExpression = new SecureCompiledScript(engine.compile(expression)); // sandboxed script
 	}
-	
-	
+
 	public String getExpression() {
 		return expression;
 	}
-	
-	
+
 	public Throwable getLastException() {
 		return lastException;
 	}
-	
-	
+
 	public boolean matches(Object value) throws ScriptException {
 		return matches(new ExpressionBindings(value));
 	}
-	
-	
+
 	public boolean matches(Bindings bindings) throws ScriptException {
 		this.lastException = null;
-		
+
 		// use privileged bindings so we are not restricted by the script sandbox
 		Bindings priviledgedBindings = PrivilegedInvocation.newProxy(Bindings.class, bindings, AccessController.getContext());
-		
+
 		// initialize script context with the privileged bindings
 		ScriptContext context = new SimpleScriptContext();
 		context.setBindings(priviledgedBindings, ScriptContext.GLOBAL_SCOPE);
-		
+
 		try {
 			// evaluate user script
-			Object value = userScript.eval(context);
-			
-			// convert value to boolean
-			Bindings valueBinding = new SimpleBindings();
-			valueBinding.put("value", value);
-			Object result = asBooleanScript.eval(valueBinding);
-			if (result instanceof Boolean) {
-				return (Boolean) result;
-			}
+			Object value = compiledExpression.eval(context);
+
+			// value as boolean
+			return DefaultTypeTransformation.castToBoolean(value);
 		} catch (Throwable e) {
 			// ignore any and all scripting exceptions
 			this.lastException = e;
 		}
-		
+
 		return false;
 	}
-	
+
 }