diff --git a/js-assembler/assemble-perform-statement.rkt b/js-assembler/assemble-perform-statement.rkt
index 956c611..61db922 100644
--- a/js-assembler/assemble-perform-statement.rkt
+++ b/js-assembler/assemble-perform-statement.rkt
@@ -79,7 +79,7 @@
                                 ",")))]
     
     [(InstallClosureValues!? op)
-     "M.env.splice.apply(M.env,[M.env.length, 0].concat(M.proc.closedVals));"]
+     "M.env.push.apply(M.env,M.proc.closedVals);"]
     
     [(RestoreEnvironment!? op)
      "M.env=M.env[M.env.length-2].slice(0);"]
diff --git a/js-assembler/runtime-src/baselib-functions.js b/js-assembler/runtime-src/baselib-functions.js
index 9f659cb..0de0ed5 100644
--- a/js-assembler/runtime-src/baselib-functions.js
+++ b/js-assembler/runtime-src/baselib-functions.js
@@ -65,8 +65,7 @@
         var i, returnArgs = [].slice.call(arguments, 1);
 
         // clear out stack space
-        // TODO: replace with a splice.
-        MACHINE.env.length = MACHINE.env.length - MACHINE.argcount;
+        MACHINE.env.length -= MACHINE.argcount;
 
         if (returnArgs.length === 1) {
             MACHINE.val = returnArgs[0];
@@ -77,10 +76,7 @@
         } else {
             MACHINE.argcount = returnArgs.length;
             MACHINE.val = returnArgs.shift();
-            // TODO: replace with a splice.
-            for (i = 0; i < MACHINE.argcount - 1; i++) {
-                MACHINE.env.push(returnArgs.pop());
-            }
+            MACHINE.env.push.apply(MACHINE.env, returnArgs.reverse());
             return MACHINE.control.pop().label.multipleValueReturn(MACHINE);
         }
     };