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-rw-r--r--src/libutil/archive.hh1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/libutil/archive.hh b/src/libutil/archive.hh
index 06f09cd1ec45..fff62031397c 100644
--- a/src/libutil/archive.hh
+++ b/src/libutil/archive.hh
@@ -62,6 +62,7 @@ struct ParseSink
     
     virtual void createRegularFile(const Path & path) { };
     virtual void isExecutable() { };
+    virtual void preallocateContents(unsigned long long size) { };
     virtual void receiveContents(unsigned char * data, unsigned int len) { };
 
     virtual void createSymlink(const Path & path, const string & target) { };