diff --git a/src/libstore/globals.hh b/src/libstore/globals.hh
index cf4ae63cdc2f214a2ed0183f9c43a4764626e4b5..6b3e204536f1cf0093a5dca362d172ab0d8883aa 100644
--- a/src/libstore/globals.hh
+++ b/src/libstore/globals.hh
@@ -82,9 +82,9 @@ public:
     /* Whether to show build log output in real time. */
     bool verboseBuild = true;
 
-    /* If verboseBuild is false, the number of lines of the tail of
-       the log to show if a build fails. */
-    size_t logLines = 10;
+    Setting<size_t> logLines{this, 10, "log-lines",
+        "If verbose-build is false, the number of lines of the tail of "
+        "the log to show if a build fails."};
 
     MaxBuildJobsSetting maxBuildJobs{this, 1, "max-jobs",
         "Maximum number of parallel build jobs. \"auto\" means use number of cores.",