diff --git a/MagicalRecord/Categories/NSManagedObject/NSManagedObject+MagicalDataImport.m b/MagicalRecord/Categories/NSManagedObject/NSManagedObject+MagicalDataImport.m
index 7921036ce..1cb47c3c3 100644
--- a/MagicalRecord/Categories/NSManagedObject/NSManagedObject+MagicalDataImport.m
+++ b/MagicalRecord/Categories/NSManagedObject/NSManagedObject+MagicalDataImport.m
@@ -172,7 +172,10 @@ - (void)MR_setRelationships:(NSDictionary *)relationships forKeysWithObject:(id)
 
         NSRelationshipDescription *relationshipInfo = [relationships valueForKey:relationshipName];
 
-        NSString *lookupKey = [[relationshipInfo userInfo] objectForKey:kMagicalRecordImportRelationshipMapKey] ?: relationshipName;
+        NSString *lookupKey = [relationshipData MR_lookupKeyForAttribute:relationshipInfo];
+        if (lookupKey == nil) {
+            lookupKey = [[relationshipInfo userInfo] objectForKey:kMagicalRecordImportRelationshipMapKey] ?: relationshipName;
+        }
 
         id relatedObjectData;