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-rw-r--r--src/libutil/thread-pool.hh2
1 files changed, 2 insertions, 0 deletions
diff --git a/src/libutil/thread-pool.hh b/src/libutil/thread-pool.hh
index 78b63467d62e..b64dc52d473e 100644
--- a/src/libutil/thread-pool.hh
+++ b/src/libutil/thread-pool.hh
@@ -10,6 +10,8 @@
 
 namespace nix {
 
+MakeError(ThreadPoolShutDown, Error)
+
 /* A simple thread pool that executes a queue of work items
    (lambdas). */
 class ThreadPool