diff --git a/src/java/org/marianoguerra/rhino/DynamicScopeContextFactory.java b/src/java/org/marianoguerra/rhino/DynamicScopeContextFactory.java
new file mode 100644
index 0000000..6284281
--- /dev/null
+++ b/src/java/org/marianoguerra/rhino/DynamicScopeContextFactory.java
@@ -0,0 +1,20 @@
+package org.marianoguerra.rhino;
+
+import org.mozilla.javascript.Context;
+import org.mozilla.javascript.ContextFactory;
+
+public class DynamicScopeContextFactory extends ContextFactory {
+	public static boolean useDynamicScope;
+
+	@Override
+	protected boolean hasFeature(Context cx, int featureIndex) {
+		if (featureIndex == Context.FEATURE_DYNAMIC_SCOPE)
+			return useDynamicScope;
+		else
+			return super.hasFeature(cx, featureIndex);
+	}
+
+	static {
+		ContextFactory.initGlobal(new DynamicScopeContextFactory());
+	}
+}