diff --git a/windows/mkerrors.bash b/windows/mkerrors.bash
index a70b24f3..f5c6888b 100755
--- a/windows/mkerrors.bash
+++ b/windows/mkerrors.bash
@@ -7,7 +7,6 @@
 set -e
 shopt -s nullglob
 
-[[ $# -eq 1 ]] || { echo "Usage: $0 OUTPUT_FILE.go" >&2; exit 1; }
 winerror="$(printf '%s\n' "/mnt/c/Program Files (x86)/Windows Kits/"/*/Include/*/shared/winerror.h | sort -Vr | head -n 1)"
 [[ -n $winerror ]] || { echo "Unable to find winerror.h" >&2; exit 1; }
 
@@ -61,4 +60,4 @@ declare -A errors
 	done < "$winerror"
 
 	echo ")"
-} | gofmt > "$1"
+} | gofmt > "zerrors_windows.go"
diff --git a/windows/mkerrors.go b/windows/mkerrors.go
deleted file mode 100644
index a204e6ca..00000000
--- a/windows/mkerrors.go
+++ /dev/null
@@ -1,9 +0,0 @@
-// Copyright 2019 The Go Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
-
-// +build generate
-
-package windows
-
-//go:generate ./mkerrors.bash zerrors_windows.go