diff --git a/aws_lambda_builders/workflows/nodejs_npm_esbuild/workflow.py b/aws_lambda_builders/workflows/nodejs_npm_esbuild/workflow.py
index 478b5dfc4..1ea3e898c 100644
--- a/aws_lambda_builders/workflows/nodejs_npm_esbuild/workflow.py
+++ b/aws_lambda_builders/workflows/nodejs_npm_esbuild/workflow.py
@@ -183,8 +183,16 @@ def get_resolvers(self):
         return [PathResolver(runtime=self.runtime, binary="npm")]
 
     def _get_esbuild_subprocess(self) -> SubprocessEsbuild:
+        """
+        Creates a subprocess object that is able to invoke the esbuild executable.
+
+        Returns
+        -------
+        SubprocessEsbuild
+            An esbuild specific subprocess object
+        """
         try:
-            npm_bin_path_root = self.subprocess_npm.run(["root"], cwd=self.scratch_dir)
+            npm_bin_path_root = self.subprocess_npm.run(["root"], cwd=self.build_dir)
             npm_bin_path = str(Path(npm_bin_path_root, ".bin"))
         except FileNotFoundError:
             raise EsbuildExecutionError(message="The esbuild workflow couldn't find npm installed on your system.")
diff --git a/tests/unit/workflows/nodejs_npm_esbuild/test_workflow.py b/tests/unit/workflows/nodejs_npm_esbuild/test_workflow.py
index d528072c4..a851e7bc1 100644
--- a/tests/unit/workflows/nodejs_npm_esbuild/test_workflow.py
+++ b/tests/unit/workflows/nodejs_npm_esbuild/test_workflow.py
@@ -3,6 +3,7 @@
 from unittest import TestCase
 from unittest.mock import ANY, patch, call
 
+from parameterized import parameterized
 from aws_lambda_builders.actions import (
     CopySourceAction,
     CleanUpAction,
@@ -379,10 +380,10 @@ def test_workflow_sets_up_npm_actions_with_download_dependencies_without_depende
 
         self.assertIsInstance(workflow.actions[0], CopySourceAction)
         self.assertIsInstance(workflow.actions[1], CopySourceAction)
-        self.assertEquals(workflow.actions[1].source_dir, "not_source")
-        self.assertEquals(workflow.actions[1].dest_dir, "scratch_dir")
+        self.assertEqual(workflow.actions[1].source_dir, "not_source")
+        self.assertEqual(workflow.actions[1].dest_dir, "scratch_dir")
         self.assertIsInstance(workflow.actions[2], NodejsNpmInstallAction)
-        self.assertEquals(workflow.actions[2].install_dir, "scratch_dir")
+        self.assertEqual(workflow.actions[2].install_dir, "scratch_dir")
         self.assertIsInstance(workflow.actions[3], EsbuildBundleAction)
 
     @patch("aws_lambda_builders.workflows.nodejs_npm.workflow.NodejsNpmWorkflow.can_use_install_links")
@@ -405,10 +406,10 @@ def test_workflow_sets_up_npm_actions_with_download_dependencies_without_depende
         self.assertEqual(len(workflow.actions), 3)
 
         self.assertIsInstance(workflow.actions[0], NodejsNpmInstallAction)
-        self.assertEquals(workflow.actions[0].install_dir, "not_source")
+        self.assertEqual(workflow.actions[0].install_dir, "not_source")
         self.assertIsInstance(workflow.actions[1], LinkSinglePathAction)
-        self.assertEquals(workflow.actions[1]._source, os.path.join("not_source", "node_modules"))
-        self.assertEquals(workflow.actions[1]._dest, os.path.join("source", "node_modules"))
+        self.assertEqual(workflow.actions[1]._source, os.path.join("not_source", "node_modules"))
+        self.assertEqual(workflow.actions[1]._dest, os.path.join("source", "node_modules"))
         self.assertIsInstance(workflow.actions[2], EsbuildBundleAction)
 
     @patch("aws_lambda_builders.workflows.nodejs_npm.workflow.NodejsNpmWorkflow.can_use_install_links")
@@ -440,3 +441,28 @@ def test_workflow_revert_build_in_source(self, install_action_mock, install_link
             build_options=ANY,
             install_links=False,
         )
+
+    @parameterized.expand(
+        [
+            (True, "source"),
+            (False, "scratch_dir"),
+        ]
+    )
+    @patch("aws_lambda_builders.workflows.nodejs_npm.workflow.NodejsNpmWorkflow.can_use_install_links")
+    @patch("aws_lambda_builders.workflows.nodejs_npm_esbuild.workflow.SubprocessNpm.run")
+    @patch("aws_lambda_builders.workflows.nodejs_npm_esbuild.workflow.Path")
+    def test_finds_correct_esbuild_binary(
+        self, is_building_in_source, expected_dir, path_mock, subprocess_run_mock, install_links_mock
+    ):
+        install_links_mock.return_value = True
+
+        NodejsNpmEsbuildWorkflow(
+            source_dir="source",
+            artifacts_dir="artifacts",
+            scratch_dir="scratch_dir",
+            manifest_path="source/manifest",
+            osutils=self.osutils,
+            build_in_source=is_building_in_source,
+        )
+
+        subprocess_run_mock.assert_called_with(ANY, cwd=expected_dir)