diff --git a/owrx/metrics.py b/owrx/metrics.py
index 6600e85..063bd5c 100644
--- a/owrx/metrics.py
+++ b/owrx/metrics.py
@@ -42,6 +42,7 @@ class Metrics(object):
         self.addMetric("openwebrx.users", DirectMetric(ClientRegistry.getSharedInstance().clientCount))
 
     def addMetric(self, name, metric):
+        name = name.replace(' ','_') 
         self.metrics[name] = metric
 
     def hasMetric(self, name):