diff --git a/js-assembler/assemble-helpers.rkt b/js-assembler/assemble-helpers.rkt
index e0cb282..504a735 100644
--- a/js-assembler/assemble-helpers.rkt
+++ b/js-assembler/assemble-helpers.rkt
@@ -103,7 +103,7 @@
 
 (: assemble-control-frame-temporary (ControlFrameTemporary -> String))
 (define (assemble-control-frame-temporary t)
-  (format "M.control[M.control.length-1].~a"
+  (format "M.c[M.c.length-1].~a"
           (ControlFrameTemporary-name t)))
 
 ;; fixme: use js->string
@@ -313,12 +313,12 @@
 
 (: assemble-control-stack-label (ControlStackLabel -> String))
 (define (assemble-control-stack-label a-csl)
-  "M.control[M.control.length-1].label")
+  "M.c[M.c.length-1].label")
 
 
 (: assemble-control-stack-label/multiple-value-return (ControlStackLabel/MultipleValueReturn -> String))
 (define (assemble-control-stack-label/multiple-value-return a-csl)
-  "M.control[M.control.length-1].label.mvr")
+  "M.c[M.c.length-1].label.mvr")
 
 
 
diff --git a/js-assembler/assemble-perform-statement.rkt b/js-assembler/assemble-perform-statement.rkt
index af19019..f7fa8ec 100644
--- a/js-assembler/assemble-perform-statement.rkt
+++ b/js-assembler/assemble-perform-statement.rkt
@@ -98,7 +98,7 @@
                           ","))]
     
     [(SetFrameCallee!? op)
-     (format "M.control[M.control.length-1].proc=~a;"
+     (format "M.c[M.c.length-1].proc=~a;"
              (assemble-oparg (SetFrameCallee!-proc op)))]
     
     [(SpliceListIntoStack!? op)
@@ -112,7 +112,7 @@
 
     [(InstallContinuationMarkEntry!? op)
      (string-append "M.installContinuationMarkEntry("
-                    "M.control[M.control.length-1].pendingContinuationMarkKey,"
+                    "M.c[M.c.length-1].pendingContinuationMarkKey,"
                     "M.val);")]
 
     [(RaiseContextExpectedValuesError!? op)
diff --git a/js-assembler/assemble.rkt b/js-assembler/assemble.rkt
index c4b510b..58d4c35 100644
--- a/js-assembler/assemble.rkt
+++ b/js-assembler/assemble.rkt
@@ -483,10 +483,10 @@ EOF
       (assemble-jump (GotoStatement-target stmt))]
      
      [(PushControlFrame/Generic? stmt)
-      "M.control.push(new RT.Frame());"]
+      "M.c.push(new RT.Frame());"]
      
      [(PushControlFrame/Call? stmt)
-      (format "M.control.push(new RT.CallFrame(~a,M.proc));" 
+      (format "M.c.push(new RT.CallFrame(~a,M.proc));" 
               (let: ([label : (U Symbol LinkedLabel) (PushControlFrame/Call-label stmt)])
                 (cond
                   [(symbol? label) 
@@ -496,7 +496,7 @@ EOF
      
      [(PushControlFrame/Prompt? stmt)
       ;; fixme: use a different frame structure
-      (format "M.control.push(new RT.PromptFrame(~a,~a));" 
+      (format "M.c.push(new RT.PromptFrame(~a,~a));" 
               (let: ([label : (U Symbol LinkedLabel) (PushControlFrame/Prompt-label stmt)])
                 (cond
                   [(symbol? label) 
@@ -513,7 +513,7 @@ EOF
                    (assemble-oparg tag)])))]
      
      [(PopControlFrame? stmt)
-      "M.control.pop();"]
+      "M.c.pop();"]
      
      [(PushEnvironment? stmt)
       (cond [(= (PushEnvironment-n stmt) 0)
diff --git a/js-assembler/package.rkt b/js-assembler/package.rkt
index 68b8d99..211ca0e 100644
--- a/js-assembler/package.rkt
+++ b/js-assembler/package.rkt
@@ -164,7 +164,7 @@
              (function(MACHINE, EXPORTS){~a})(M, exports);
              ~a
              modrec.privateExports = exports;
-             return M.control.pop().label(M);"
+             return M.c.pop().label(M);"
                       (symbol->string name)
                       text
                       (get-provided-name-code bytecode))])
diff --git a/js-assembler/runtime-src/baselib-functions.js b/js-assembler/runtime-src/baselib-functions.js
index 9ff0eee..e58732d 100644
--- a/js-assembler/runtime-src/baselib-functions.js
+++ b/js-assembler/runtime-src/baselib-functions.js
@@ -69,15 +69,15 @@
 
         if (returnArgs.length === 1) {
             MACHINE.val = returnArgs[0];
-            return MACHINE.control.pop().label(MACHINE);
+            return MACHINE.c.pop().label(MACHINE);
         } else if (returnArgs.length === 0) {
             MACHINE.a = 0;
-            return MACHINE.control.pop().label.mvr(MACHINE);
+            return MACHINE.c.pop().label.mvr(MACHINE);
         } else {
             MACHINE.a = returnArgs.length;
             MACHINE.val = returnArgs.shift();
             MACHINE.e.push.apply(MACHINE.e, returnArgs.reverse());
-            return MACHINE.control.pop().label.mvr(MACHINE);
+            return MACHINE.c.pop().label.mvr(MACHINE);
         }
     };
 
@@ -179,7 +179,7 @@
                     });
             };
 
-            MACHINE.control.push(
+            MACHINE.c.push(
                 new baselib.frames.CallFrame(afterGoodInvoke, v));
             MACHINE.a = arguments.length - 2;
             var i;
@@ -276,7 +276,7 @@
                 });
             };
 
-            MACHINE.control.push(
+            MACHINE.c.push(
                 new baselib.frames.CallFrame(afterGoodInvoke, proc));
             MACHINE.a = arguments.length - 4;
             for (i = 0; i < arguments.length - 4; i++) {
@@ -326,7 +326,7 @@
                                --M.cbt;
                                M.val = f(M);
                                M.e.length -= M.a;
-                               return M.control.pop().label(M);
+                               return M.c.pop().label(M);
                            },
                            []);
     };
diff --git a/js-assembler/runtime-src/baselib-modules.js b/js-assembler/runtime-src/baselib-modules.js
index ee98f15..15aa6af 100644
--- a/js-assembler/runtime-src/baselib-modules.js
+++ b/js-assembler/runtime-src/baselib-modules.js
@@ -66,7 +66,7 @@
                 MACHINE.params['currentErrorHandler'] = oldErrorHandler;
                 fail(MACHINE, anError);
             };
-            MACHINE.control.push(new plt.baselib.frames.CallFrame(afterGoodInvoke, null));
+            MACHINE.c.push(new plt.baselib.frames.CallFrame(afterGoodInvoke, null));
             if (isInternal) {
                 throw that.label;
             } else {
diff --git a/js-assembler/runtime-src/runtime.js b/js-assembler/runtime-src/runtime.js
index 674a8d1..1a200cd 100644
--- a/js-assembler/runtime-src/runtime.js
+++ b/js-assembler/runtime-src/runtime.js
@@ -216,7 +216,7 @@
 	this.proc = undefined;        // procedure register
 	this.a = undefined;           // argument count
 	this.e = [];                // environment
-	this.control = [];            // control: Arrayof (U Frame CallFrame PromptFrame)
+	this.c = [];            // control: Arrayof (U Frame CallFrame PromptFrame)
 	this.running = false;
 	this.modules = {};     // String -> ModuleRecord
         this.mainModules = []; // Arrayof String
@@ -293,10 +293,10 @@
     Machine.prototype.captureControl = function(skip, tag) {
 	var MACHINE = this;
 	var i;
-	for (i = MACHINE.control.length - 1 - skip; i >= 0; i--) {
-	    if (MACHINE.control[i].tag === tag) {
-		return MACHINE.control.slice(i + 1,
-					     MACHINE.control.length - skip);
+	for (i = MACHINE.c.length - 1 - skip; i >= 0; i--) {
+	    if (MACHINE.c[i].tag === tag) {
+		return MACHINE.c.slice(i + 1,
+					     MACHINE.c.length - skip);
 	    }
 	} 
 	raise(MACHINE, new Error("captureControl: unable to find tag " + tag));
@@ -311,10 +311,10 @@
     Machine.prototype.restoreControl = function(tag) {
 	var MACHINE = this;
 	var i;
-	for (i = MACHINE.control.length - 1; i >= 0; i--) {
-	    if (MACHINE.control[i].tag === tag) {
-		MACHINE.control = 
-		    MACHINE.control.slice(0, i+1).concat(
+	for (i = MACHINE.c.length - 1; i >= 0; i--) {
+	    if (MACHINE.c[i].tag === tag) {
+		MACHINE.c = 
+		    MACHINE.c.slice(0, i+1).concat(
 			MACHINE.e[MACHINE.e.length - 1]);
 		return;
 	    }
@@ -359,7 +359,7 @@
 
     // Save the continuation mark on the top control frame.
     Machine.prototype.installContinuationMarkEntry = function(key, value) {
-        var frame = this.control[this.control.length - 1];
+        var frame = this.c[this.c.length - 1];
         var marks = frame.marks;
         var i;
         for (i = 0; i < marks.length; i++) {
@@ -375,7 +375,7 @@
     Machine.prototype.captureContinuationMarks = function() {
         var kvLists = [];
         var i;
-        var control = this.control;
+        var control = this.c;
         var tracedCalleeKey = getTracedCalleeKey(this);
         for (i = control.length-1; i >= 0; i--) {
             if (control[i].marks.length !== 0) {