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-rw-r--r--src/archive.hh2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/archive.hh b/src/archive.hh
index 7d9b1e2b5676..e6006e454942 100644
--- a/src/archive.hh
+++ b/src/archive.hh
@@ -54,7 +54,7 @@ struct RestoreSource
        pointed to by data.  It should block if that much data is not
        yet available, or throw an error if it is not going to be
        available. */
-    virtual void operator () (const unsigned char * data, unsigned int len) = 0;
+    virtual void operator () (unsigned char * data, unsigned int len) = 0;
 };
 
 void restorePath(const string & path, RestoreSource & source);