diff --git a/lib/jsonrpc-adapter.js b/lib/jsonrpc-adapter.js
index 0d98e3b7..986b7446 100644
--- a/lib/jsonrpc-adapter.js
+++ b/lib/jsonrpc-adapter.js
@@ -97,20 +97,26 @@ JsonRpcAdapter.errorHandler = function() {
   };
 };
 
-// A mock wrapper function to help code generation via mockWrapper.toString()
-function mockWrapper(method) {
-  return function(__args__) {
-    var args = Array.prototype.slice.call(arguments);
-    if (method.isStatic) {
-      method.getFunction().apply(method.ctor, args);
-    } else {
-      method.sharedCtor.invoke(method, function(err, instance) {
-        method.getFunction().apply(instance, args);
-      });
-    }
-  };
-}
-
+// A mock wrapper function to help code generation.
+// Note that we can't make it a real function and use .toString() on it because
+// that causes a whole world of trouble when we run strong-remoting's unit tests
+// with code coverage.
+var mockWrapper = [
+'function mockWrapper(method) {',
+'  return function(__args__) {',
+'    var args = Array.prototype.slice.call(arguments);',
+'    if (method.isStatic) {',
+'      method.getFunction().apply(method.ctor, args);',
+'    } else {',
+'      method.sharedCtor.invoke(method, function(err, instance) {',
+'        method.getFunction().apply(instance, args);',
+'      });',
+'    }',
+'  };',
+'}',
+].join('\n');
+
+/* istanbul ignore next */
 JsonRpcAdapter.prototype.createHandler = function() {
 
   var root = express.Router();