diff --git a/libtaskmanager/taskmanagerrulesrc b/libtaskmanager/taskmanagerrulesrc
--- a/libtaskmanager/taskmanagerrulesrc
+++ b/libtaskmanager/taskmanagerrulesrc
@@ -17,32 +17,27 @@
 
 [Rewrite Rules][google-chrome][1]
 Property=ClassName
-Identifier=DesktopEntryName
+Identifier=StartupWMClass
 Match=(?<=crx_)(?'match'[a-z]+)
-Target=chrome-%1-default
 
 # Google changed the class to be "Google-chrome" around version 54
 [Rewrite Rules][Google-chrome][1]
 Property=ClassName
-Identifier=DesktopEntryName
+Identifier=StartupWMClass
 Match=(?<=crx_)(?'match'[a-z]+)
-Target=chrome-%1-default
 
 [Rewrite Rules][chromium][1]
 Property=ClassName
-Identifier=DesktopEntryName
+Identifier=StartupWMClass
 Match=(?<=crx_)(?'match'[a-z]+)
-Target=chrome-%1-default
 
 [Rewrite Rules][chromium-browser][1]
 Property=ClassName
-Identifier=DesktopEntryName
+Identifier=StartupWMClass
 Match=(?<=crx_)(?'match'[a-z]+)
-Target=chrome-%1-default
 
 # Chromium changed the class too
 [Rewrite Rules][Chromium][1]
 Property=ClassName
-Identifier=DesktopEntryName
+Identifier=StartupWMClass
 Match=(?<=crx_)(?'match'[a-z]+)
-Target=chrome-%1-default
diff --git a/libtaskmanager/xwindowtasksmodel.cpp b/libtaskmanager/xwindowtasksmodel.cpp
--- a/libtaskmanager/xwindowtasksmodel.cpp
+++ b/libtaskmanager/xwindowtasksmodel.cpp
@@ -592,7 +592,11 @@
                             continue;
                         }
 
-                        const QString rewrittenString = ruleGroup.readEntry(QStringLiteral("Target")).arg(actualMatch);
+                        QString rewrittenString = ruleGroup.readEntry(QStringLiteral("Target")).arg(actualMatch);
+                        // If no "Target" is provided, instead assume the matched property (ClassClass/ClassName).
+                        if (rewrittenString.isEmpty()) {
+                            rewrittenString = matchProperty;
+                        }
 
                         services = KServiceTypeTrader::self()->query(QStringLiteral("Application"), QStringLiteral("exist Exec and ('%1' =~ %2)").arg(rewrittenString, serviceSearchIdentifier));