diff --git a/SDWebImage/SDDiskCache.m b/SDWebImage/SDDiskCache.m
index 539cd68b..bac439f7 100644
--- a/SDWebImage/SDDiskCache.m
+++ b/SDWebImage/SDDiskCache.m
@@ -177,10 +177,10 @@
         // Target half of our maximum cache size for this cleanup pass.
         const NSUInteger desiredCacheSize = maxCacheSize / 2;
         
-        // Sort the remaining cache files by their last modification time (oldest first).
+        // Sort the remaining cache files by their last modification time or last access time (oldest first).
         NSArray<NSURL *> *sortedFiles = [cacheFiles keysSortedByValueWithOptions:NSSortConcurrent
                                                                  usingComparator:^NSComparisonResult(id obj1, id obj2) {
-                                                                     return [obj1[NSURLContentModificationDateKey] compare:obj2[NSURLContentModificationDateKey]];
+                                                                     return [obj1[cacheContentDateKey] compare:obj2[cacheContentDateKey]];
                                                                  }];
         
         // Delete files until we fall below our desired cache size.