diff --git a/package.json b/package.json
index 948e7130a..e1a23179b 100644
--- a/package.json
+++ b/package.json
@@ -36,6 +36,7 @@
     "json": "9.0.4",
     "json-loader": "0.5.4",
     "lodash.defaultsdeep": "4.6.0",
+    "minilog": "3.0.1",
     "promise": "7.1.1",
     "scratch-blocks": "latest",
     "scratch-render": "latest",
diff --git a/src/engine/execute.js b/src/engine/execute.js
index 9017ff240..847fac0ff 100644
--- a/src/engine/execute.js
+++ b/src/engine/execute.js
@@ -1,3 +1,4 @@
+var log = require('../util/log');
 var Thread = require('./thread');
 
 /**
@@ -52,7 +53,7 @@ var execute = function (sequencer, thread) {
 
 
     if (!opcode) {
-        console.warn('Could not get opcode for block: ' + currentBlockId);
+        log.warn('Could not get opcode for block: ' + currentBlockId);
         return;
     }
 
@@ -110,7 +111,7 @@ var execute = function (sequencer, thread) {
                     handleReport(fields[fieldKey].value);
                 }
             } else {
-                console.warn('Could not get implementation for opcode: ' +
+                log.warn('Could not get implementation for opcode: ' +
                     opcode);
             }
             thread.requestScriptGlowInFrame = true;
@@ -234,7 +235,7 @@ var execute = function (sequencer, thread) {
         }, function (rejectionReason) {
             // Promise rejected: the primitive had some error.
             // Log it and proceed.
-            console.warn('Primitive rejected promise: ', rejectionReason);
+            log.warn('Primitive rejected promise: ', rejectionReason);
             thread.status = Thread.STATUS_RUNNING;
             thread.popStack();
         });
diff --git a/src/import/sb2import.js b/src/import/sb2import.js
index a2526c3d0..b09c7c536 100644
--- a/src/import/sb2import.js
+++ b/src/import/sb2import.js
@@ -9,6 +9,7 @@ var Blocks = require('../engine/blocks');
 var Clone = require('../sprites/clone');
 var Sprite = require('../sprites/sprite');
 var Color = require('../util/color.js');
+var log = require('../util/log');
 var uid = require('../util/uid');
 var specMap = require('./sb2specmap');
 var Variable = require('../engine/variable');
@@ -251,7 +252,7 @@ var parseBlock = function (sb2block) {
     var oldOpcode = sb2block[0];
     // Convert the block using the specMap. See sb2specmap.js.
     if (!oldOpcode || !specMap[oldOpcode]) {
-        console.warn('Couldn\'t find SB2 block: ', oldOpcode);
+        log.warn('Couldn\'t find SB2 block: ', oldOpcode);
         return;
     }
     var blockMetadata = specMap[oldOpcode];
diff --git a/src/sprites/clone.js b/src/sprites/clone.js
index c5e8e0ca6..e49bbf82d 100644
--- a/src/sprites/clone.js
+++ b/src/sprites/clone.js
@@ -1,4 +1,6 @@
 var util = require('util');
+
+var log = require('../util/log');
 var MathUtil = require('../util/math-util');
 var Target = require('../engine/target');
 
@@ -211,10 +213,10 @@ Clone.prototype.setSay = function (type, message) {
     }
     // @todo: Render to stage.
     if (!type || !message) {
-        console.log('Clearing say bubble');
+        log.info('Clearing say bubble');
         return;
     }
-    console.log('Setting say bubble:', type, message);
+    log.info('Setting say bubble:', type, message);
 };
 
 /**
diff --git a/src/util/log.js b/src/util/log.js
new file mode 100644
index 000000000..28e596a12
--- /dev/null
+++ b/src/util/log.js
@@ -0,0 +1,4 @@
+var minilog = require('minilog');
+minilog.enable();
+
+module.exports = minilog('vm');