diff --git a/Sources/SPTPersistentCache.m b/Sources/SPTPersistentCache.m
index 9aa9956..779da76 100644
--- a/Sources/SPTPersistentCache.m
+++ b/Sources/SPTPersistentCache.m
@@ -1048,7 +1048,8 @@ - (NSMutableArray *)storedImageNamesAndAttributes
                 NSNumber *fsize = [NSNumber numberWithLongLong:fileStat.st_size];
                 NSDictionary *values = @{NSFileModificationDate : mdate, NSFileSize: fsize};
 
-                [images addObject:@{ SPTDataCacheFileNameKey : [NSString stringWithUTF8String:[theURL fileSystemRepresentation]],
+                NSString *cacheFilename = [NSString stringWithUTF8String:[theURL fileSystemRepresentation]];
+                [images addObject:@{ SPTDataCacheFileNameKey : cacheFilename,
                                      SPTDataCacheFileAttributesKey : values }];
             }
         } else {