diff --git a/Source/Categories/NSManagedObject+MagicalRecord.m b/Source/Categories/NSManagedObject+MagicalRecord.m
index 77cbe90..aca7f8d 100644
--- a/Source/Categories/NSManagedObject+MagicalRecord.m
+++ b/Source/Categories/NSManagedObject+MagicalRecord.m
@@ -113,7 +113,7 @@ static NSUInteger defaultBatchSize = kMagicalRecordDefaultBatchSize;
 			}
 			else
 			{
-				MRLog(@"Property '%@' not found in %@ properties for %@", propertyName, [propDict count], NSStringFromClass(self));
+				MRLog(@"Property '%@' not found in %d properties for %@", propertyName, [propDict count], NSStringFromClass(self));
 			}
 		}
 	}