diff --git a/src/app/FakeLib/AssemblyInfoFile.fs b/src/app/FakeLib/AssemblyInfoFile.fs
index 7e423844d02..b863c90575e 100644
--- a/src/app/FakeLib/AssemblyInfoFile.fs
+++ b/src/app/FakeLib/AssemblyInfoFile.fs
@@ -101,7 +101,9 @@ type Attribute(name, value, inNamespace) =
 let private writeToFile outputFileName (lines : seq<string>) = 
     let fi = fileInfo outputFileName
     if fi.Exists then fi.Delete()
-    System.IO.Directory.CreateDirectory(System.IO.Path.GetDirectoryName(outputFileName)) |> ignore
+    let dirName = System.IO.Path.GetDirectoryName(outputFileName)
+    if not (isNullOrEmpty dirName) then
+        System.IO.Directory.CreateDirectory(dirName) |> ignore    
     use writer = new System.IO.StreamWriter(outputFileName, false, System.Text.Encoding.UTF8)
     lines |> Seq.iter writer.WriteLine
     tracefn "Created AssemblyInfo file \"%s\"." outputFileName