diff --git a/include/linux/percpu_counter.h b/include/linux/percpu_counter.h
index b9df9ed..d5dd465 100644
--- a/include/linux/percpu_counter.h
+++ b/include/linux/percpu_counter.h
@@ -83,7 +83,7 @@
 	return (fbc->counters != NULL);
 }
 
-#else
+#else /* !CONFIG_SMP */
 
 struct percpu_counter {
 	s64 count;