diff --git a/AMBuildScript b/AMBuildScript
index f90a1d8..bbdbd49 100644
--- a/AMBuildScript
+++ b/AMBuildScript
@@ -76,7 +76,7 @@ class MMSConfig(object):
   def findSdkPath(self, sdk_name):
     dir_name = 'hl2sdk-{}'.format(sdk_name)
     if builder.options.hl2sdk_root:
-      sdk_path = os.path.join(builder.options.hl2sdk_root, dir_name)
+      sdk_path = os.path.abspath(os.path.normpath(os.path.join(builder.options.hl2sdk_root, dir_name)))
       if os.path.exists(sdk_path):
         return sdk_path
     return ResolveEnvPath('HL2SDK{}'.format(sdk_name.upper()), dir_name)