diff --git a/src/de.hpi.swa.trufflesqueak/src/de/hpi/swa/trufflesqueak/nodes/plugins/NullPlugin.java b/src/de.hpi.swa.trufflesqueak/src/de/hpi/swa/trufflesqueak/nodes/plugins/NullPlugin.java
index 148cfcc7a..6294c5e05 100644
--- a/src/de.hpi.swa.trufflesqueak/src/de/hpi/swa/trufflesqueak/nodes/plugins/NullPlugin.java
+++ b/src/de.hpi.swa.trufflesqueak/src/de/hpi/swa/trufflesqueak/nodes/plugins/NullPlugin.java
@@ -29,6 +29,15 @@
 import de.hpi.swa.trufflesqueak.util.MiscUtils;
 
 public final class NullPlugin extends AbstractPrimitiveFactoryHolder {
+    @GenerateNodeFactory
+    @SqueakPrimitive(names = "primitiveScreenScaleFactor")
+    protected abstract static class PrimScreenScaleFactorNode extends AbstractPrimitiveNode {
+        @Specialization
+        protected static final double doGet(@SuppressWarnings("unused") final Object receiver) {
+            return 1.0d;
+        }
+    }
+
     @GenerateNodeFactory
     @SqueakPrimitive(names = "primitiveHighResClock")
     protected abstract static class PrimHighResClockNode extends AbstractPrimitiveNode {
@@ -49,7 +58,7 @@ protected final boolean doGet(@SuppressWarnings("unused") final Object receiver)
 
     @GenerateNodeFactory
     @SqueakPrimitive(names = "primitiveMultipleBytecodeSetsActive")
-    protected abstract static class PrimMultipleBytecodeSetsActive1Node extends AbstractPrimitiveNode {
+    protected abstract static class PrimMultipleBytecodeSetsActive1Node extends AbstractPrimitiveNode implements BinaryPrimitiveFallback {
         @Specialization
         protected final boolean doSet(@SuppressWarnings("unused") final Object receiver, final boolean value) {
             final int imageFormat = getContext().imageFormat;