diff --git a/NeuroML2/testSyns.net.nml b/NeuroML2/testSyns.net.nml
index b2b21f5..c58c9b5 100644
--- a/NeuroML2/testSyns.net.nml
+++ b/NeuroML2/testSyns.net.nml
@@ -15,7 +15,7 @@
 
     <network id="net" type="networkWithTemperature" temperature="35 degC">
 
-        <population id="pop0" component="cell" type="populationList" size="4">
+        <population id="pop0" component="cell" type="populationList" size="5">
             <instance id="0">
                 <location x="0" y="0" z="0"/>
             </instance>