diff --git a/example.rules b/example.rules
index b98e3252..a44fecf4 100644
--- a/example.rules
+++ b/example.rules
@@ -2,7 +2,7 @@
 instance:node_cpus:count = count(node_cpu{mode="idle"}) without (cpu,mode)
 
 # CPU in use by CPU.
-instance_cpu:node_cpu_not_idle:rate5m = sum rate(node_cpu{mode!="idle"}[5m])) without (mode)
+instance_cpu:node_cpu_not_idle:rate5m = sum(rate(node_cpu{mode!="idle"}[5m])) without (mode)
 
 # CPU in use by mode.
-instance_mode:node_cpu:rate5m = sum rate(node_cpu[5m])) without (cpu)
+instance_mode:node_cpu:rate5m = sum(rate(node_cpu[5m])) without (cpu)