diff --git a/com.oracle.truffle.r.engine/src/com/oracle/truffle/r/engine/interop/RForeignAccessFactoryImpl.java b/com.oracle.truffle.r.engine/src/com/oracle/truffle/r/engine/interop/RForeignAccessFactoryImpl.java
index 539084c106f1deb0d9d370ce262782e63698b9f0..604725de03901d2cc9219489c34e6b7c9fbc4472 100644
--- a/com.oracle.truffle.r.engine/src/com/oracle/truffle/r/engine/interop/RForeignAccessFactoryImpl.java
+++ b/com.oracle.truffle.r.engine/src/com/oracle/truffle/r/engine/interop/RForeignAccessFactoryImpl.java
@@ -52,6 +52,7 @@ import com.oracle.truffle.r.runtime.data.RRawVector;
 import com.oracle.truffle.r.runtime.data.RStringVector;
 import com.oracle.truffle.r.runtime.data.RSymbol;
 import com.oracle.truffle.r.runtime.data.RTruffleObject;
+import com.oracle.truffle.r.runtime.data.RUnboundValue;
 import com.oracle.truffle.r.runtime.data.model.RAbstractVector;
 import com.oracle.truffle.r.runtime.env.REnvironment;
 import com.oracle.truffle.r.runtime.ffi.DLL;
@@ -94,7 +95,7 @@ public final class RForeignAccessFactoryImpl implements RForeignAccessFactory {
                     RRawVector.class, RComplexVector.class, RStringVector.class, RLogicalVector.class,
                     RFunction.class, RNull.class, REnvironment.class,
                     RList.class, RSymbol.class,
-                    RPairList.class, RExternalPtr.class,
+                    RPairList.class, RExternalPtr.class, RUnboundValue.class,
                     DLLInfo.class, DotSymbol.class};
 
     private static final class ForeignAccessState {
@@ -205,6 +206,8 @@ public final class RForeignAccessFactoryImpl implements RForeignAccessFactory {
                 foreignAccess = RSymbolMRForeign.createAccess();
             } else if (RExternalPtr.class.isAssignableFrom(clazz)) {
                 foreignAccess = RExternalPtrMRForeign.createAccess();
+            } else if (RUnboundValue.class.isAssignableFrom(clazz)) {
+                foreignAccess = RUnboundValueMRForeign.createAccess();
             } else {
                 if (RAbstractVector.class.isAssignableFrom(clazz)) {
                     foreignAccess = ForeignAccess.create(RAbstractVector.class, new RAbstractVectorAccessFactory());
diff --git a/com.oracle.truffle.r.engine/src/com/oracle/truffle/r/engine/interop/RUnboundValueMR.java b/com.oracle.truffle.r.engine/src/com/oracle/truffle/r/engine/interop/RUnboundValueMR.java
new file mode 100644
index 0000000000000000000000000000000000000000..ff0c179f53dafceb6e7ea0ca17e89896190b0fd2
--- /dev/null
+++ b/com.oracle.truffle.r.engine/src/com/oracle/truffle/r/engine/interop/RUnboundValueMR.java
@@ -0,0 +1,64 @@
+/*
+ * Copyright (c) 2016, 2016, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+package com.oracle.truffle.r.engine.interop;
+
+import com.oracle.truffle.api.interop.CanResolve;
+import com.oracle.truffle.api.interop.MessageResolution;
+import com.oracle.truffle.api.interop.Resolve;
+import com.oracle.truffle.api.interop.TruffleObject;
+import com.oracle.truffle.api.nodes.Node;
+import com.oracle.truffle.r.engine.TruffleRLanguage;
+import com.oracle.truffle.r.runtime.data.RUnboundValue;
+
+@MessageResolution(receiverType = RUnboundValue.class, language = TruffleRLanguage.class)
+public class RUnboundValueMR {
+    @Resolve(message = "IS_BOXED")
+    public abstract static class RUnboundValueIsBoxedNode extends Node {
+        protected Object access(@SuppressWarnings("unused") RUnboundValue receiver) {
+            return false;
+        }
+    }
+
+    @Resolve(message = "HAS_SIZE")
+    public abstract static class RUnboundValueHasSizeNode extends Node {
+        protected Object access(@SuppressWarnings("unused") RUnboundValue receiver) {
+            return false;
+        }
+    }
+
+    @Resolve(message = "IS_NULL")
+    public abstract static class RUnboundValueIsNullNode extends Node {
+        protected Object access(@SuppressWarnings("unused") RUnboundValue receiver) {
+            return false;
+        }
+    }
+
+    @CanResolve
+    public abstract static class RUnboundValueCheck extends Node {
+
+        protected static boolean test(TruffleObject receiver) {
+            return receiver instanceof RUnboundValue;
+        }
+    }
+
+}