diff --git a/src/hydra-queue-runner/hydra-queue-runner.cc b/src/hydra-queue-runner/hydra-queue-runner.cc
index 727a728f..f20c8e73 100644
--- a/src/hydra-queue-runner/hydra-queue-runner.cc
+++ b/src/hydra-queue-runner/hydra-queue-runner.cc
@@ -7,7 +7,6 @@
 #include <fcntl.h>
 
 #include <prometheus/exposer.h>
-#include <prometheus/gauge.h>
 
 #include "state.hh"
 #include "build-result.hh"