diff --git a/SORelativeDateTransformer/SORelativeDateTransformer.m b/SORelativeDateTransformer/SORelativeDateTransformer.m
index fd031dd..351a480 100644
--- a/SORelativeDateTransformer/SORelativeDateTransformer.m
+++ b/SORelativeDateTransformer/SORelativeDateTransformer.m
@@ -19,7 +19,7 @@ + (NSBundle *)bundle {
     static NSBundle *bundle = nil;
     static dispatch_once_t onceToken;
     dispatch_once(&onceToken, ^{
-        NSURL *url = [[NSBundle mainBundle] URLForResource:@"SORelativeDateTransformer" withExtension:@"bundle"];
+        NSURL *url = [[NSBundle bundleForClass:[self class]] URLForResource:@"SORelativeDateTransformer" withExtension:@"bundle"];
         bundle = [[NSBundle alloc] initWithURL:url];
     });
     return bundle;