diff --git a/src/Xamarin.Android.Tools.AndroidSdk/Sdks/AndroidSdkWindows.cs b/src/Xamarin.Android.Tools.AndroidSdk/Sdks/AndroidSdkWindows.cs
index 549267e..a8b30ce 100644
--- a/src/Xamarin.Android.Tools.AndroidSdk/Sdks/AndroidSdkWindows.cs
+++ b/src/Xamarin.Android.Tools.AndroidSdk/Sdks/AndroidSdkWindows.cs
@@ -229,7 +229,8 @@ protected override IEnumerable<string> GetAllAvailableAndroidNdks ()
 			string ndk;
 
 			var sdks = GetAllAvailableAndroidSdks().ToList();
-			sdks.Add(AndroidSdkPath);
+			if (!string.IsNullOrEmpty(AndroidSdkPath))
+				sdks.Add(AndroidSdkPath);
 	
 			foreach(var sdk in sdks.Distinct())
 				if (Directory.Exists(ndk = Path.Combine(sdk, "ndk-bundle")))