diff --git a/tinygrad/runtime/support/hcq.py b/tinygrad/runtime/support/hcq.py
index 804224ce41..318737b6a4 100644
--- a/tinygrad/runtime/support/hcq.py
+++ b/tinygrad/runtime/support/hcq.py
@@ -1,6 +1,6 @@
 from __future__ import annotations
 from typing import cast, Callable, Type, TypeVar, Generic, Any
-import contextlib, decimal, statistics, time, ctypes, array, os, fcntl, struct, traceback, collections
+import contextlib, decimal, statistics, time, ctypes, array, os, struct, traceback, collections
 from tinygrad.helpers import PROFILE, getenv, to_mv, round_up, ProfileRangeEvent
 from tinygrad.renderer import Renderer
 from tinygrad.device import BufferSpec, Compiler, Compiled, LRUAllocator, ProfileDeviceEvent, ProfileProgramEvent
@@ -25,7 +25,9 @@ class FileIOInterface:
     self.fd:int = fd or os.open(path, flags)
   def __del__(self):
     if hasattr(self, 'fd'): os.close(self.fd)
-  def ioctl(self, request, arg): return fcntl.ioctl(self.fd, request, arg)
+  def ioctl(self, request, arg):
+    import fcntl # to support windows
+    return fcntl.ioctl(self.fd, request, arg)
   def mmap(self, start, sz, prot, flags, offset):
     x = libc.mmap(start, sz, prot, flags, self.fd, offset)
     if x == 0xffffffffffffffff: raise OSError(f"Failed to mmap {sz} bytes at {hex(start)}: {os.strerror(ctypes.get_errno())}")
diff --git a/tinygrad/runtime/support/system.py b/tinygrad/runtime/support/system.py
index 4014aff5be..169407aad9 100644
--- a/tinygrad/runtime/support/system.py
+++ b/tinygrad/runtime/support/system.py
@@ -1,4 +1,4 @@
-import os, mmap, array, functools, ctypes, select, contextlib, dataclasses, sys, fcntl
+import os, mmap, array, functools, ctypes, select, contextlib, dataclasses, sys
 from typing import cast, ClassVar
 from tinygrad.helpers import round_up, to_mv, getenv, OSX, temp
 from tinygrad.runtime.autogen import libc, vfio
@@ -55,6 +55,8 @@ class _System:
     except OSError: return None
 
   def flock_acquire(self, name:str) -> int:
+    import fcntl # to support windows
+
     os.umask(0) # Set umask to 0 to allow creating files with 0666 permissions
 
     # Avoid O_CREAT because we don’t want to re-create/replace an existing file (triggers extra perms checks) when opening as non-owner.