diff --git a/com.oracle.truffle.r.nodes/src/com/oracle/truffle/r/nodes/builtin/InternalNode.java b/com.oracle.truffle.r.nodes/src/com/oracle/truffle/r/nodes/builtin/InternalNode.java
index 7b9821cf939a82abfaf28afd57fa7eda7a5fad15..7fceec433df39e63feb9c9b22ecee7b34d0a9d07 100644
--- a/com.oracle.truffle.r.nodes/src/com/oracle/truffle/r/nodes/builtin/InternalNode.java
+++ b/com.oracle.truffle.r.nodes/src/com/oracle/truffle/r/nodes/builtin/InternalNode.java
@@ -43,7 +43,6 @@ import com.oracle.truffle.r.runtime.context.RContext;
 import com.oracle.truffle.r.runtime.data.RArgsValuesAndNames;
 import com.oracle.truffle.r.runtime.data.REmpty;
 import com.oracle.truffle.r.runtime.data.RFunction;
-import com.oracle.truffle.r.runtime.data.RPromise;
 import com.oracle.truffle.r.runtime.data.model.RAbstractStringVector;
 import com.oracle.truffle.r.runtime.nodes.RBaseNode;
 import com.oracle.truffle.r.runtime.nodes.RNode;
@@ -246,7 +245,6 @@ public abstract class InternalNode extends OperatorNode {
             Object[] args = new Object[arguments.length];
             for (int i = 0; i < args.length; i++) {
                 args[i] = arguments[i].execute(frame);
-                assert !(args[i] instanceof RPromise);
             }
             return args;
         }
@@ -275,7 +273,6 @@ public abstract class InternalNode extends OperatorNode {
                     value = forcePromises(frame, (RArgsValuesAndNames) value);
                 }
                 args[i] = value;
-                assert !(args[i] instanceof RPromise);
             }
             return args;
         }
@@ -284,7 +281,6 @@ public abstract class InternalNode extends OperatorNode {
             Object[] array = new Object[varArgs.getLength()];
             for (int i = 0; i < array.length; i++) {
                 array[i] = promiseHelper.checkEvaluate(frame, varArgs.getArgument(i));
-                assert !(array[i] instanceof RPromise);
             }
             return new RArgsValuesAndNames(array, varArgs.getSignature());
         }
@@ -307,12 +303,10 @@ public abstract class InternalNode extends OperatorNode {
 
             for (int i = 0; i < args.length - 1; i++) {
                 args[i] = arguments[i].execute(frame);
-                assert !(args[i] instanceof RPromise);
             }
             Object[] varArgs = new Object[arguments.length - (factory.getSignature().getLength() - 1)];
             for (int i = 0; i < varArgs.length; i++) {
                 varArgs[i] = arguments[args.length - 1 + i].execute(frame);
-                assert !(varArgs[i] instanceof RPromise);
             }
             args[args.length - 1] = new RArgsValuesAndNames(varArgs, ArgumentsSignature.empty(varArgs.length));
             return args;