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--- a/src/utils/md5.cpp
+++ b/src/utils/md5.cpp
@@ -368,7 +368,7 @@
 class FileScanMd5 : public FileScanDo {
 public:
     FileScanMd5(string& d) : digest(d) {}
-    virtual bool init(unsigned int size, string *)
+    virtual bool init(size_t size, string *)
     {
 	MD5Init(&ctx);
 	return true;