diff --git a/rhino/src/main/java/org/mozilla/javascript/Icode.java b/rhino/src/main/java/org/mozilla/javascript/Icode.java
index 8e87db775f..ed8bc8f188 100644
--- a/rhino/src/main/java/org/mozilla/javascript/Icode.java
+++ b/rhino/src/main/java/org/mozilla/javascript/Icode.java
@@ -20,8 +20,11 @@ abstract class Icode {
             // Stack: ... value2 value1 -> ... value2 value1 value2 value1
             Icode_DUP2 = Icode_DUP - 1,
 
+            // Stack: ... value2 value1 -> ... value1 value2
+            Icode_SWAP = Icode_DUP2 - 1,
+
             // Stack: ... value1 -> ...
-            Icode_POP = Icode_DUP2 - 1,
+            Icode_POP = Icode_SWAP - 1,
 
             // Store stack top into return register and then pop it
             Icode_POP_RESULT = Icode_POP - 1,
@@ -179,6 +182,8 @@ static String bytecodeName(int bytecode) {
                 return "DUP";
             case Icode_DUP2:
                 return "DUP2";
+            case Icode_SWAP:
+                return "SWAP";
             case Icode_POP:
                 return "POP";
             case Icode_POP_RESULT:
diff --git a/rhino/src/main/java/org/mozilla/javascript/Interpreter.java b/rhino/src/main/java/org/mozilla/javascript/Interpreter.java
index 25ac7db4d8..cbd6dd8ced 100644
--- a/rhino/src/main/java/org/mozilla/javascript/Interpreter.java
+++ b/rhino/src/main/java/org/mozilla/javascript/Interpreter.java
@@ -1539,6 +1539,16 @@ private static Object interpretLoop(Context cx, CallFrame frame, Object throwabl
                                 sDbl[stackTop + 2] = sDbl[stackTop];
                                 stackTop += 2;
                                 continue Loop;
+                            case Icode_SWAP:
+                                {
+                                    Object o = stack[stackTop];
+                                    stack[stackTop] = stack[stackTop - 1];
+                                    stack[stackTop - 1] = o;
+                                    double d = sDbl[stackTop];
+                                    sDbl[stackTop] = sDbl[stackTop - 1];
+                                    sDbl[stackTop - 1] = d;
+                                    continue Loop;
+                                }
                             case Token.RETURN:
                                 frame.result = stack[stackTop];
                                 frame.resultDbl = sDbl[stackTop];