diff --git a/GreenshotCore/GreenshotCore.csproj b/GreenshotCore/GreenshotCore.csproj
index 08aee65bd..636cc2e72 100644
--- a/GreenshotCore/GreenshotCore.csproj
+++ b/GreenshotCore/GreenshotCore.csproj
@@ -91,6 +91,7 @@
     </Compile>
     <Compile Include="Helpers\ClipboardHelper.cs" />
     <Compile Include="Helpers\CopyData.cs" />
+    <Compile Include="Helpers\CredentialsHelper.cs" />
     <Compile Include="Helpers\EnvironmentInfo.cs" />
     <Compile Include="Helpers\FilenameHelper.cs" />
     <Compile Include="Helpers\HotkeyHelper.cs" />
diff --git a/GreenshotCore/Helpers/CredentialsHelper.cs b/GreenshotCore/Helpers/CredentialsHelper.cs
index 6da3cfad8..c1df46d3d 100644
--- a/GreenshotCore/Helpers/CredentialsHelper.cs
+++ b/GreenshotCore/Helpers/CredentialsHelper.cs
@@ -20,12 +20,14 @@
  */
 using System;
 using System.Drawing;
-using System.Runtime.InteropServices;
 using System.Reflection;
+using System.Runtime.InteropServices;
 using System.Text;
 using System.Threading;
 using System.Windows.Forms;
 
+using Greenshot.UnmanagedHelpers;
+
 /// <summary>
 /// The following code comes from: http://www.developerfusion.com/code/4693/using-the-credential-management-api/
 /// and is slightly modified so it works for us.
@@ -423,10 +425,12 @@ namespace Greenshot.Helpers {
 				password, CREDUI.MAX_PASSWORD_LENGTH,
 				ref saveChecked,
 				flags
-				);
+			);
 
 			// clean up resources
-			if (this.Banner != null) GDI32.DeleteObject(info.hbmBanner);
+			if (this.Banner != null) {
+				GDI32.DeleteObject(info.hbmBanner);
+			}
 
 			// set the accessors from the api call parameters
 			this.Name = name.ToString();
@@ -514,14 +518,6 @@ namespace Greenshot.Helpers {
 		}
 	}
 
-	public sealed class GDI32 {
-		private GDI32() {
-		}
-
-		[DllImport("gdi32.dll", EntryPoint="DeleteObject")]
-		public static extern bool DeleteObject(IntPtr hObject);
-	}
-
 	public sealed class CREDUI {
 		private CREDUI() {
 		}