diff --git a/metrics/metrics_library.cc b/metrics/metrics_library.cc
index 0f2a7d900..d2c1b0fd1 100644
--- a/metrics/metrics_library.cc
+++ b/metrics/metrics_library.cc
@@ -126,7 +126,7 @@ bool MetricsLibrary::IsGuestMode() {
                        &result)) {
     return false;
   }
-  return result && access("/var/run/state/logged-in", F_OK) == 0;
+  return result && (access("/var/run/state/logged-in", F_OK) == 0);
 }
 
 bool MetricsLibrary::AreMetricsEnabled() {