diff --git a/experiments/maki-interpreter/cli.js b/experiments/maki-interpreter/cli.js
index 55e084f1..9bf68417 100755
--- a/experiments/maki-interpreter/cli.js
+++ b/experiments/maki-interpreter/cli.js
@@ -10,7 +10,7 @@ function main() {
   const relativePath = process.argv[2];
   const buffer = fs.readFileSync(path.join(__dirname, relativePath));
   const system = new System();
-  run({ runtime, buffer, system });
+  run({ runtime, buffer, system, log: true });
 }
 
 main();
diff --git a/experiments/maki-interpreter/interpreter.js b/experiments/maki-interpreter/interpreter.js
index 166da474..f5c0ad68 100644
--- a/experiments/maki-interpreter/interpreter.js
+++ b/experiments/maki-interpreter/interpreter.js
@@ -2,7 +2,7 @@ const parse = require("./parser");
 const { getClass } = require("./objects");
 const interpret = require("./virtualMachine");
 
-function main({ runtime, buffer, system }) {
+function main({ runtime, buffer, system, log }) {
   const program = parse(buffer);
 
   // Set the System global
@@ -11,7 +11,7 @@ function main({ runtime, buffer, system }) {
   // Replace class hashes with actual JavaScript classes from the runtime
   program.classes = program.classes.map(hash => {
     const resolved = runtime[hash];
-    if (resolved == null) {
+    if (resolved == null && log) {
       const klass = getClass(hash);
       console.warn(
         `Class missing from runtime: ${hash} expected ${klass.name}`
@@ -23,7 +23,7 @@ function main({ runtime, buffer, system }) {
   // Bind toplevel handlers.
   program.bindings.forEach(binding => {
     const handler = () => {
-      return interpret(binding.commandOffset, program);
+      return interpret(binding.commandOffset, program, { log });
     };
 
     // For now we only know how to handle System handlers.
diff --git a/experiments/maki-interpreter/interpreter.test.js b/experiments/maki-interpreter/interpreter.test.js
new file mode 100644
index 00000000..f6e48cde
--- /dev/null
+++ b/experiments/maki-interpreter/interpreter.test.js
@@ -0,0 +1,32 @@
+const fs = require("fs");
+const path = require("path");
+const System = require("./runtime/System");
+const runtime = require("./runtime");
+const interpret = require("./interpreter");
+
+function runFile(relativePath) {
+  const system = new System();
+  const buffer = fs.readFileSync(path.join(__dirname, relativePath));
+  interpret({ runtime, buffer, system, log: false });
+}
+
+describe("v1.1.1.b3 (Winamp 3.0 full)", () => {
+  test("can call messageBox with hello World", () => {
+    const mockMessageBox = jest.fn();
+    // The VM depends upon the arity of this function, so we can't use
+    // `mockMessageBox` directly.
+    System.prototype.messageBox = function(a, b, c, d) {
+      mockMessageBox(a, b, c, d);
+    };
+    runFile(
+      "./reference/maki_compiler/v1.1.1.b3 (Winamp 3.0 full)/hello_world.maki"
+    );
+    expect(mockMessageBox).toHaveBeenCalledTimes(1);
+    expect(mockMessageBox).toHaveBeenCalledWith(
+      "Hello World",
+      "Hello Title",
+      1,
+      null
+    );
+  });
+});
diff --git a/experiments/maki-interpreter/reference/maki_compiler/v1.1.1.b3 (Winamp 3.0 full)/hello_world.m b/experiments/maki-interpreter/reference/maki_compiler/v1.1.1.b3 (Winamp 3.0 full)/hello_world.m
new file mode 100755
index 00000000..4075b023
--- /dev/null
+++ b/experiments/maki-interpreter/reference/maki_compiler/v1.1.1.b3 (Winamp 3.0 full)/hello_world.m	
@@ -0,0 +1,7 @@
+#include "lib/std.mi"
+
+System.onScriptLoaded()
+{ 
+	String response;
+	System.messageBox("Hello World", "Hello Title", 1, response);
+}
\ No newline at end of file
diff --git a/experiments/maki-interpreter/reference/maki_compiler/v1.1.1.b3 (Winamp 3.0 full)/hello_world.maki b/experiments/maki-interpreter/reference/maki_compiler/v1.1.1.b3 (Winamp 3.0 full)/hello_world.maki
new file mode 100755
index 00000000..237bcb6c
Binary files /dev/null and b/experiments/maki-interpreter/reference/maki_compiler/v1.1.1.b3 (Winamp 3.0 full)/hello_world.maki differ
diff --git a/experiments/maki-interpreter/runtime/System.js b/experiments/maki-interpreter/runtime/System.js
index c5134df6..fb3425f9 100644
--- a/experiments/maki-interpreter/runtime/System.js
+++ b/experiments/maki-interpreter/runtime/System.js
@@ -35,8 +35,8 @@ class System extends MakiObject {
   getParam() {
     return "Some String";
   }
-  messagebox(message, var2, var3, var4) {
-    alert(message);
+  messageBox(message, msgtitle, flag, notanymoreId) {
+    console.log({ message, msgtitle, flag, notanymoreId });
   }
 }
 
diff --git a/experiments/maki-interpreter/virtualMachine.js b/experiments/maki-interpreter/virtualMachine.js
index 97f01962..d2f7fe2d 100644
--- a/experiments/maki-interpreter/virtualMachine.js
+++ b/experiments/maki-interpreter/virtualMachine.js
@@ -1,7 +1,7 @@
 const { printCommand } = require("./prettyPrinter");
 
-const log = true;
-function interpret(start, { commands, methods, variables, classes }) {
+function interpret(start, program, { log = false }) {
+  const { commands, methods, variables, classes } = program;
   // Run all the commands that are safe to run. Increment this number to find
   // the next bug.
   const stack = [];