Objective-C releasing a property declared in a category?

I have a category on an existing class that adds a property and a few methods to the class.

@interface AClass (ACategory) {
    NSString *aProperty;
}

@property (nonatomic, retain) NSString *aProperty;

@end

In the implementation file, I want to release this property when the object is deallocated. However, if I declare dealloc in this class, it will override the dealloc from the original class from what I understand. What then is the proper way to release this aProperty when the object is deallocated?

@implementation AClass (ACategory)

@synthesize aProperty;

- (void)dealloc {
    [aProperty release];
    // this will skip the original dealloc method from what I understand
    [super dealloc];
}

@end