diff --git a/db/version_set.cc b/db/version_set.cc
index bda1b56ab..17ba77922 100644
--- a/db/version_set.cc
+++ b/db/version_set.cc
@@ -1207,6 +1207,7 @@ class VersionSet::Builder {
           return BySmallestKey(f1, f2, internal_comparator);
       }
       assert(false);
+      return false;
     }
   };