diff --git a/cartographer/cloud/BUILD.bazel b/cartographer/cloud/BUILD.bazel
index 2cb0a6c..8aa5ff5 100644
--- a/cartographer/cloud/BUILD.bazel
+++ b/cartographer/cloud/BUILD.bazel
@@ -63,6 +63,7 @@ cc_library(
         "**/*.h",
     ]),
     copts = ["-Wno-sign-compare"],
+    defines = ["USE_PROMETHEUS=1"],
     includes = ["."],
     deps = [
         ":cc_protos",