diff --git a/com.oracle.truffle.r.test/src/com/oracle/truffle/r/test/engine/interop/AbstractMRTest.java b/com.oracle.truffle.r.test/src/com/oracle/truffle/r/test/engine/interop/AbstractMRTest.java
index 7ab8608b3588f6a60444863dc9c3a53cc8568168..a92d2dfdbb3725ee7826f1d2b6e71accee2a04e9 100644
--- a/com.oracle.truffle.r.test/src/com/oracle/truffle/r/test/engine/interop/AbstractMRTest.java
+++ b/com.oracle.truffle.r.test/src/com/oracle/truffle/r/test/engine/interop/AbstractMRTest.java
@@ -81,7 +81,7 @@ public abstract class AbstractMRTest {
     }
 
     protected boolean isPointer(@SuppressWarnings("unused") TruffleObject obj) {
-        return false;
+        return true;
     }
 
     protected boolean isBoxed(@SuppressWarnings("unused") TruffleObject obj) {