diff --git a/bundles/org.eclipse.core.runtime/src/org/eclipse/core/internal/runtime/InternalPlatform.java b/bundles/org.eclipse.core.runtime/src/org/eclipse/core/internal/runtime/InternalPlatform.java
index 49a59e7..cbba836 100644
--- a/bundles/org.eclipse.core.runtime/src/org/eclipse/core/internal/runtime/InternalPlatform.java
+++ b/bundles/org.eclipse.core.runtime/src/org/eclipse/core/internal/runtime/InternalPlatform.java
@@ -87,7 +87,7 @@
 
 	private static final InternalPlatform singleton = new InternalPlatform();
 
-	private static final String[] WS_LIST = {Platform.WS_CARBON, Platform.WS_GTK, Platform.WS_MOTIF, Platform.WS_PHOTON, Platform.WS_WIN32};
+	private static final String[] WS_LIST = {Platform.WS_CARBON, Platform.WS_GTK, Platform.WS_MOTIF, Platform.WS_PHOTON, Platform.WS_WIN32, Platform.WS_WPF};
 	private Path cachedInstanceLocation; // Cache the path of the instance location
 	private ServiceTracker configurationLocation = null;
 	private BundleContext context;
diff --git a/bundles/org.eclipse.core.runtime/src/org/eclipse/core/runtime/Platform.java b/bundles/org.eclipse.core.runtime/src/org/eclipse/core/runtime/Platform.java
index 9569644..ed2d7d5 100644
--- a/bundles/org.eclipse.core.runtime/src/org/eclipse/core/runtime/Platform.java
+++ b/bundles/org.eclipse.core.runtime/src/org/eclipse/core/runtime/Platform.java
@@ -403,6 +403,13 @@
 	public static final String WS_CARBON = "carbon";//$NON-NLS-1$
 
 	/**
+	 * Constant string (value "wpf") indicating the platform is running on a
+	 * machine using the WPF windowing system.
+	 * @since 3.3
+	 */
+	public static final String WS_WPF = "wpf";//$NON-NLS-1$
+
+	/**
 	 * Constant string (value "unknown") indicating the platform is running on a
 	 * machine running an unknown windowing system.
 	 * <p>