gistfile1.txt

diff --git a/lib/module.js b/lib/module.js
index fb233d6..a2f6faa 100644
--- a/lib/module.js
+++ b/lib/module.js
@@ -103,20 +103,35 @@ function tryPackage(requestPath, exts, isMain) {
   if (!pkg) return false;
 
   var filename = path.resolve(requestPath, pkg);
+  var _filename = path.resolve(requestPath, '_' + pkg);
+
+  // if the desired package exists as a prefixed version, use its real path
+  // otherwise, use the original name and treat it as a regular dependency
+  return readPackagePath(_filename, exts, true) ||
+    readPackagePath(filename, exts, isMain);
+}
+
+function readPackagePath(filename, exts, isMain) {
   return tryFile(filename, isMain) ||
          tryExtensions(filename, exts, isMain) ||
          tryExtensions(path.resolve(filename, 'index'), exts, isMain);
 }
 
+function readFilePath(requestPath, isMain) {
+  if (isMain) {
+    return fs.realpathSync(requestPath);
+  }
+  return path.resolve(requestPath);
+}
+
 // check if the file exists and is not a directory
 // resolve to the absolute realpath if running main module,
 // otherwise resolve to absolute while keeping symlinks intact.
 function tryFile(requestPath, isMain) {
   const rc = stat(requestPath);
-  if (isMain) {
-    return rc === 0 && fs.realpathSync(requestPath);
+  if (rc === 0) {
+    return readFilePath(requestPath, isMain);
   }
-  return rc === 0 && path.resolve(requestPath);
 }
 
 // given a path check a the file exists with any of the set extensions
@@ -159,11 +174,7 @@ Module._findPath = function(request, paths, isMain) {
     if (!trailingSlash) {
       const rc = stat(basePath);
       if (rc === 0) {  // File.
-        if (!isMain) {
-          filename = path.resolve(basePath);
-        } else {
-          filename = fs.realpathSync(basePath);
-        }
+        filename = readFilePath(basePath, isMain);
       } else if (rc === 1) {  // Directory.
         if (exts === undefined)
           exts = Object.keys(Module._extensions);
@@ -427,6 +438,7 @@ Module._resolveFilename = function(request, parent, isMain) {
   }
 
   var resolvedModule = Module._resolveLookupPaths(request, parent);
+
   var id = resolvedModule[0];
   var paths = resolvedModule[1];
 

function readFilePath(requestPath, isMain) { rename isMain to needRealpath or another true expression name will be better.