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-rw-r--r--src/libstore/store.hh2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/libstore/store.hh b/src/libstore/store.hh
index 25a6bc8b9669..c27918cbb4f9 100644
--- a/src/libstore/store.hh
+++ b/src/libstore/store.hh
@@ -83,7 +83,7 @@ bool isValidPath(const Path & path);
 
 /* Constructs a unique store path name. */
 Path makeStorePath(const string & type,
-    Hash & hash, const string & suffix);
+    const Hash & hash, const string & suffix);
     
 /* Copy the contents of a path to the store and register the validity
    the resulting path.  The resulting path is returned. */