Index: src/org/python/core/PyFunction.java
===================================================================
--- src/org/python/core/PyFunction.java	(revision 6980)
+++ src/org/python/core/PyFunction.java	(working copy)
@@ -397,14 +397,19 @@
     public Object __tojava__(Class<?> c) {
         // Automatically coerce to single method interfaces
         if (c.isInterface() && c.getDeclaredMethods().length == 1) {
+        	final Method interfaceMethod = c.getDeclaredMethods()[0];
             return Proxy.newProxyInstance(c.getClassLoader(), new Class[]{c}, new InvocationHandler() {
                 // XXX: not the most efficient implementation - the invocation handler could be shared
                 public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
-                    if (args == null || args.length == 0) {
-                        return __call__().__tojava__(method.getReturnType());
-                    } else {
-                        return __call__(Py.javas2pys(args)).__tojava__(method.getReturnType());
-                    }
+                	if (method.equals(interfaceMethod)) {
+	                    if (args == null || args.length == 0) {
+	                        return __call__().__tojava__(method.getReturnType());
+	                    } else {
+	                        return __call__(Py.javas2pys(args)).__tojava__(method.getReturnType());
+	                    }
+                	} else {
+                		return method.invoke(this, args);
+                	}
                 }
             });
         }