diff --git a/js-assembler/runtime-src/runtime.js b/js-assembler/runtime-src/runtime.js
index 07c65b2..398fb9e 100644
--- a/js-assembler/runtime-src/runtime.js
+++ b/js-assembler/runtime-src/runtime.js
@@ -441,13 +441,14 @@
     //
     var recomputeMaxNumBouncesBeforeYield;
 
-    var scheduleTrampoline = function(MACHINE, f) {
+    var scheduleTrampoline = function(MACHINE, f, before) {
         setTimeout(
 	    function() { 
                 MACHINE.exclusiveLock.acquire(
                     'scheduleTrampoline',
                     function(release) {                        
                         release();
+                        if (before) { before(); }
                         MACHINE.trampoline(f); 
                     });
             },
@@ -460,8 +461,7 @@
     var makeRestartFunction = function(MACHINE) {
         var oldArgcount = MACHINE.a;
         return function(f) { 
-            MACHINE.a = oldArgcount;
-            return scheduleTrampoline(MACHINE, f);
+            return scheduleTrampoline(MACHINE, f, function() { MACHINE.a = oldArgcount; });
         };
     };
 
diff --git a/version.rkt b/version.rkt
index 10e1aaf..750354d 100644
--- a/version.rkt
+++ b/version.rkt
@@ -7,4 +7,4 @@
 (provide version)
 (: version String)
 
-(define version "1.98")
+(define version "1.100")