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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 bcaea401e260..bcf11ce96318 100644
--- a/src/libstore/store.hh
+++ b/src/libstore/store.hh
@@ -28,7 +28,7 @@ struct Substitute
        is the store path to be substituted). */
     Strings args;
 
-    bool operator == (const Substitute & sub);
+    bool operator == (const Substitute & sub) const;
 };
 
 typedef list<Substitute> Substitutes;