diff --git a/history.txt b/history.txt
index 6edd6f9d..9df423fa 100755
--- a/history.txt
+++ b/history.txt
@@ -4073,3 +4073,7 @@ in development:
 180412
 ------
 * Threads: disable detecting collision with hidden sprites
+
+180413
+------
+* Objects: added implicit parameter count to experimental JIT compile reporter
diff --git a/objects.js b/objects.js
index 5fcd8d89..ea52309e 100644
--- a/objects.js
+++ b/objects.js
@@ -83,7 +83,7 @@ BlockEditorMorph, BlockDialogMorph, PrototypeHatBlockMorph, localize,
 TableMorph, TableFrameMorph, normalizeCanvas, BooleanSlotMorph, HandleMorph,
 AlignmentMorph, Process, XML_Element, VectorPaintEditorMorph*/
 
-modules.objects = '2018-March-19';
+modules.objects = '2018-April-13';
 
 var SpriteMorph;
 var StageMorph;
@@ -1080,7 +1080,8 @@ SpriteMorph.prototype.initBlocks = function () {
         reportCompiled: { // experimental
             type: 'reporter',
             category: 'operators',
-            spec: 'compile %repRing'
+            spec: 'compile %repRing for %n args',
+            defaults: [null, 0]
         },
 
     /*