diff --git a/src/c0ffi.js b/src/c0ffi.js
index c3ce859..d8b1412 100644
--- a/src/c0ffi.js
+++ b/src/c0ffi.js
@@ -108,3 +108,46 @@ exports.NATIVE_STRING_TERMINATED = 92
 exports.NATIVE_STRING_TO_CHARARRAY = 93
 exports.NATIVE_STRING_TOLOWER = 94
 
+callbacks = {};
+callbacks[exports.NATIVE_STRING_LENGTH] =
+    function(args) {
+        return args[0].length;
+    };
+
+callbacks[exports.NATIVE_STRING_TO_CHARARRAY] =
+    function(args, vm) {
+        var address = vm.heap.length;
+        vm.heap.push(args[0].length+1);
+        vm.heap.push(1);
+        for (var i = 0; i < args[0].length; i++) {
+            vm.heap.push(args[0][i]);
+        }
+        vm.heap.push(0);
+        return address;
+    };
+
+
+callbacks[exports.NATIVE_STRING_FROM_CHARARRAY] =
+    function(args, vm) {
+        var i = args[0] + 2;
+        var result = "";
+        while (vm.heap[i] !== 0) {
+            result += vm.heap[i];
+            i++;
+        }
+        return result;
+    };
+
+callbacks[exports.NATIVE_CHAR_CHR] =
+    function(args) {
+        return String.fromCharCode(args[0]);
+    };
+
+callbacks[exports.NATIVE_CHAR_ORD] =
+    function(args) {
+        if (typeof args[0] == "string")
+            return args[0].charCodeAt(0);
+        return args[0];
+    };
+
+exports.default_callbacks = callbacks;
diff --git a/test/tests.js b/test/tests.js
index ad533a2..96e1d7d 100644
--- a/test/tests.js
+++ b/test/tests.js
@@ -2,7 +2,8 @@ parser = require("../src/bytecode-parser.js");
 c0vm = require("../src/c0vm.js");
 c0ffi = require("../src/c0ffi.js");
 
-var callbacks = {}
+var callbacks = c0ffi.default_callbacks;
+console.log("Initial callbacks: " + callbacks[c0ffi.NATIVE_STRING_LENGTH](["hi"]));
 var printout = "";
 
 callbacks[c0ffi.NATIVE_PRINT] = function(args) {
@@ -20,41 +21,6 @@ callbacks[c0ffi.NATIVE_PRINTLN] = function(args) {
     return 0;
 }
 
-callbacks[c0ffi.NATIVE_STRING_LENGTH] = function(args) {
-    return args[0].length;
-}
-
-callbacks[c0ffi.NATIVE_STRING_TO_CHARARRAY] = function(args, vm) {
-    var address = vm.heap.length;
-    vm.heap.push(args[0].length+1);
-    vm.heap.push(1);
-    for (var i = 0; i < args[0].length; i++) {
-        vm.heap.push(args[0][i]);
-    }
-    vm.heap.push(0);
-    return address;
-}
-
-callbacks[c0ffi.NATIVE_STRING_FROM_CHARARRAY] = function(args, vm) {
-    var i = args[0] + 2;
-    var result = "";
-    while (vm.heap[i] !== 0) {
-        result += vm.heap[i];
-        i++;
-    }
-    return result;
-}
-
-callbacks[c0ffi.NATIVE_CHAR_CHR] = function(args) {
-    return String.fromCharCode(args[0]);
-}
-
-callbacks[c0ffi.NATIVE_CHAR_ORD] = function(args) {
-    if (typeof args[0] == "string")
-        return args[0].charCodeAt(0);
-    return args[0];
-}
-
 function doTest(filename, expected_result) {
     return function(test) {
         var result = c0vm.execute(parser.parse(filename), callbacks, false);