diff --git a/src/hydra-queue-runner/Makefile.am b/src/hydra-queue-runner/Makefile.am
index 6d526c89..83242759 100644
--- a/src/hydra-queue-runner/Makefile.am
+++ b/src/hydra-queue-runner/Makefile.am
@@ -5,7 +5,8 @@ hydra_queue_runner_SOURCES = hydra-queue-runner.cc queue-monitor.cc dispatcher.c
  build-result.hh counter.hh pool.hh sync.hh token-server.hh state.hh db.hh \
  binary-cache-store.hh binary-cache-store.cc \
  local-binary-cache-store.hh local-binary-cache-store.cc \
- s3-binary-cache-store.hh s3-binary-cache-store.cc
+ s3-binary-cache-store.hh s3-binary-cache-store.cc \
+ lru-cache.hh
 hydra_queue_runner_LDADD = $(NIX_LIBS) -lpqxx
 
 AM_CXXFLAGS = $(NIX_CFLAGS) -Wall -laws-cpp-sdk-s3