diff --git a/check_apaches.py b/check_apaches.py
index 7089b7c..9c27875 100755
--- a/check_apaches.py
+++ b/check_apaches.py
@@ -72,7 +72,7 @@ class CheckApaches(MonitoringPlugin):
 
 
 	def check_worker(self, target='busy', warn='', crit=''):
-		pd = {'label':'busy', 'unit':'', 'warn':warn, 'crit': crit, 'min':0}
+		pd = {'label':'worker_busy', 'unit':'', 'warn':warn, 'crit': crit, 'min':0}
 
 		if target == 'busy':
 			returncode = self.value_wc_to_returncode(self.apache_busy, warn, crit)
@@ -82,7 +82,7 @@ class CheckApaches(MonitoringPlugin):
 			returncode = self.value_wc_to_returncode(self.apache_idle, warn, crit)
 			output = '%d idle workers' % self.apache_idle
 			pd['value'] = self.apache_idle
-			pd['label'] = 'idle'
+			pd['label'] = 'worker_idle'
 
 		return self.remember_check('worker', returncode, output, perfdata=[pd], target=target)