diff --git a/src/transforms/v2-to-v3/__fixtures__/aws-error/global-import.input.ts b/src/transforms/v2-to-v3/__fixtures__/aws-error/global-import.input.ts
new file mode 100644
index 000000000..5bbe11018
--- /dev/null
+++ b/src/transforms/v2-to-v3/__fixtures__/aws-error/global-import.input.ts
@@ -0,0 +1,8 @@
+import AWS from "aws-sdk";
+
+export const isAwsError = (error: unknown): error is AWS.AWSError => {
+  if (error === undefined) {
+    return false
+  }
+  return error instanceof Error;
+}
\ No newline at end of file
diff --git a/src/transforms/v2-to-v3/__fixtures__/aws-error/global-import.output.ts b/src/transforms/v2-to-v3/__fixtures__/aws-error/global-import.output.ts
new file mode 100644
index 000000000..2837beec3
--- /dev/null
+++ b/src/transforms/v2-to-v3/__fixtures__/aws-error/global-import.output.ts
@@ -0,0 +1,8 @@
+import { ServiceException } from "@smithy/smithy-client";
+
+export const isAwsError = (error: unknown): error is ServiceException => {
+  if (error === undefined) {
+    return false
+  }
+  return error instanceof Error;
+}
\ No newline at end of file