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-rw-r--r--src/libstore/store-api.hh2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/libstore/store-api.hh b/src/libstore/store-api.hh
index e07dec495470..68c59a9f2922 100644
--- a/src/libstore/store-api.hh
+++ b/src/libstore/store-api.hh
@@ -524,7 +524,7 @@ public:
     /* Given a set of paths that are to be built, return the set of
        derivations that will be built, and the set of output paths
        that will be substituted. */
-    void queryMissing(const PathSet & targets,
+    virtual void queryMissing(const PathSet & targets,
         PathSet & willBuild, PathSet & willSubstitute, PathSet & unknown,
         unsigned long long & downloadSize, unsigned long long & narSize);