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-rw-r--r--src/libstore/s3-binary-cache-store.hh2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/libstore/s3-binary-cache-store.hh b/src/libstore/s3-binary-cache-store.hh
index 79ab72e5a940..4d43fe4d23d8 100644
--- a/src/libstore/s3-binary-cache-store.hh
+++ b/src/libstore/s3-binary-cache-store.hh
@@ -27,7 +27,7 @@ public:
         std::atomic<uint64_t> head{0};
     };
 
-    const Stats & getS3Stats();
+    virtual const Stats & getS3Stats() = 0;
 };
 
 }