diff --git a/src/test/java/org/jitsi/meet/test/web/WebParticipantFactory.java b/src/test/java/org/jitsi/meet/test/web/WebParticipantFactory.java
index 200d87ef7..1baa0b426 100644
--- a/src/test/java/org/jitsi/meet/test/web/WebParticipantFactory.java
+++ b/src/test/java/org/jitsi/meet/test/web/WebParticipantFactory.java
@@ -280,7 +280,7 @@ else if (participantType == ParticipantType.edge)
             if (options.isHeadless())
             {
                 ops.addArguments("headless");
-                ops.addArguments("window-size=1400x600");
+                ops.addArguments("window-size=1400,600");
             }
 
             // starting version 46 we see crashes of chrome GPU process when