diff --git a/runtime/BUILD.gn b/runtime/BUILD.gn
index 1932df82beb..481fabdc09b 100644
--- a/runtime/BUILD.gn
+++ b/runtime/BUILD.gn
@@ -2,6 +2,7 @@
 # for details. All rights reserved. Use of this source code is governed by a
 # BSD-style license that can be found in the LICENSE file.
 
+import("../sdk_args.gni")
 import("configs.gni")
 import("runtime_args.gni")
 
@@ -257,7 +258,7 @@ action("generate_version_cc_file") {
     "vm/version_in.cc",
   ]
   if (dart_version_git_info) {
-    inputs += [ "../.git/logs/HEAD" ]
+    inputs += [ "$default_git_folder/logs/HEAD" ]
   }
   output = "$target_gen_dir/version.cc"
   outputs = [
diff --git a/sdk/BUILD.gn b/sdk/BUILD.gn
index 636abf8cb99..d296c28232a 100644
--- a/sdk/BUILD.gn
+++ b/sdk/BUILD.gn
@@ -15,6 +15,7 @@
 
 import("../build/dart/copy_tree.gni")
 import("../runtime/runtime_args.gni")
+import("../sdk_args.gni")
 
 declare_args() {
   # Build a SDK with less stuff. It excludes dart2js, ddc, and web libraries.
@@ -861,7 +862,7 @@ action("write_version_file") {
   visibility = [ ":create_common_sdk" ]
   inputs = [
     "../tools/VERSION",
-    "../.git/logs/HEAD",
+    "$default_git_folder/logs/HEAD",
   ]
   output = "$root_out_dir/dart-sdk/version"
   outputs = [
@@ -878,7 +879,7 @@ action("write_version_file") {
 action("write_revision_file") {
   visibility = [ ":create_common_sdk" ]
   inputs = [
-    "../.git/logs/HEAD",
+    "$default_git_folder/logs/HEAD",
   ]
   output = "$root_out_dir/dart-sdk/revision"
   outputs = [
@@ -937,7 +938,7 @@ copy("copy_license") {
 action("write_dartdoc_options") {
   visibility = [ ":create_common_sdk" ]
   inputs = [
-    "../.git/logs/HEAD",
+    "$default_git_folder/logs/HEAD",
   ]
   output = "$root_out_dir/dart-sdk/dartdoc_options.yaml"
   outputs = [
diff --git a/sdk_args.gni b/sdk_args.gni
index 0a66f18a8e6..7ebca48dc38 100644
--- a/sdk_args.gni
+++ b/sdk_args.gni
@@ -1,5 +1,26 @@
+# Copyright (c) 2019, the Dart project authors.  Please see the AUTHORS file
+# for details. All rights reserved. Use of this source code is governed by a
+# BSD-style license that can be found in the LICENSE file.
+
+_dart_root = get_path_info(".", "abspath")
+
 declare_args() {
   # Whether to use the NNBD fork of the SDK core libraries.
   # TODO(#38701): Remove this when the fork has been merged back in.
   use_nnbd = false
+
+  # Absolute path to the .git folder.
+  #
+  # This is used in rules that need to refer to `.git/logs/HEAD` to include
+  # a hash in the version string. By default the folder is `.git`, but we define
+  # it as an argument so it can be overriden by users of `git-worktree` (See
+  # Issue #33619).
+  #
+  # When using git-worktree, you can add
+  #
+  #    default_git_folder = "/path/to/main/git/repo/.git/worktrees/name/"
+  #
+  # to out/ReleaseX64/args.gn. The path above can be extracted from the `.git`
+  # file under the git worktree folder.
+  default_git_folder = "$_dart_root/.git"
 }
diff --git a/sdk_nnbd/BUILD.gn b/sdk_nnbd/BUILD.gn
index 636abf8cb99..d296c28232a 100644
--- a/sdk_nnbd/BUILD.gn
+++ b/sdk_nnbd/BUILD.gn
@@ -15,6 +15,7 @@
 
 import("../build/dart/copy_tree.gni")
 import("../runtime/runtime_args.gni")
+import("../sdk_args.gni")
 
 declare_args() {
   # Build a SDK with less stuff. It excludes dart2js, ddc, and web libraries.
@@ -861,7 +862,7 @@ action("write_version_file") {
   visibility = [ ":create_common_sdk" ]
   inputs = [
     "../tools/VERSION",
-    "../.git/logs/HEAD",
+    "$default_git_folder/logs/HEAD",
   ]
   output = "$root_out_dir/dart-sdk/version"
   outputs = [
@@ -878,7 +879,7 @@ action("write_version_file") {
 action("write_revision_file") {
   visibility = [ ":create_common_sdk" ]
   inputs = [
-    "../.git/logs/HEAD",
+    "$default_git_folder/logs/HEAD",
   ]
   output = "$root_out_dir/dart-sdk/revision"
   outputs = [
@@ -937,7 +938,7 @@ copy("copy_license") {
 action("write_dartdoc_options") {
   visibility = [ ":create_common_sdk" ]
   inputs = [
-    "../.git/logs/HEAD",
+    "$default_git_folder/logs/HEAD",
   ]
   output = "$root_out_dir/dart-sdk/dartdoc_options.yaml"
   outputs = [