diff --git a/cookbook/power_meter.rst b/cookbook/power_meter.rst
index 4ec3a985d..c829a9d93 100644
--- a/cookbook/power_meter.rst
+++ b/cookbook/power_meter.rst
@@ -17,7 +17,7 @@ Hooking it all up is quite easy: Just buy a suitable photoresistor (make sure th
 
 .. note::
 
-    Some energy meters have an exposed `S0 port <https://en.wikipedia.org/wiki/S_interface/>`__ (which essentially just is a switch that closes), if that is the case the photodiode can be replaced with the following connection.
+    Some energy meters have an exposed `S0 port <https://en.wikipedia.org/wiki/S_interface>`__ (which essentially just is a switch that closes), if that is the case the photodiode can be replaced with the following connection.
 
     .. code-block::