diff --git a/gyp_uv.py b/gyp_uv.py
index 39933f62..458e89e9 100755
--- a/gyp_uv.py
+++ b/gyp_uv.py
@@ -27,6 +27,7 @@ except ImportError:
 def host_arch():
   machine = platform.machine()
   if machine == 'i386': return 'ia32'
+  if machine == 'AMD64': return 'x64'
   if machine == 'x86_64': return 'x64'
   if machine.startswith('arm'): return 'arm'
   if machine.startswith('mips'): return 'mips'