diff --git a/showcases/visualizer/canvas/interfacetable/omnetpp.ini b/showcases/visualizer/canvas/interfacetable/omnetpp.ini
index a2c2cecdda9..5cd8d18e333 100644
--- a/showcases/visualizer/canvas/interfacetable/omnetpp.ini
+++ b/showcases/visualizer/canvas/interfacetable/omnetpp.ini
@@ -13,7 +13,7 @@ description = "Advanced features"
 *.configurator.config = xmldoc("config.xml")
 
 *.visualizer.interfaceTableVisualizer.displayInterfaceTables = true
-*.visualizer.interfaceTableVisualizer.interfaceFilter = "not lo* and not ipv4Address =~ '<unspec>'"
+*.visualizer.interfaceTableVisualizer.interfaceFilter = 'not lo* and not ipv4Address =~ "<unspec>"'
 
 *.router.hasDhcp = true
 *.router.dhcp.interface = "eth1"