diff --git a/libs/wingsdk/src/shared-gcp/function.inflight.ts b/libs/wingsdk/src/shared-gcp/function.inflight.ts
index 99ca9085f4f..e3dda783b93 100644
--- a/libs/wingsdk/src/shared-gcp/function.inflight.ts
+++ b/libs/wingsdk/src/shared-gcp/function.inflight.ts
@@ -30,7 +30,7 @@ export class FunctionClient implements IFunctionClient {
       if (!res.ok) {
         throw new Error(res.body);
       }
-      return res.body ?? "";
+      return res.body;
     } catch (error) {
       throw new Error(
         `Error while invoking the function ${this.functionName}:\n${
@@ -65,7 +65,7 @@ export class FunctionClient implements IFunctionClient {
           },
         },
       });
-      return res.data as string | undefined;
+      return (res.data as string) || undefined;
     } catch (error) {
       throw new Error(
         `Error while invoking the function ${this.functionName}:\n${
diff --git a/libs/wingsdk/src/target-tf-gcp/function.ts b/libs/wingsdk/src/target-tf-gcp/function.ts
index ac1ef1f1d5e..fd644a1f0de 100644
--- a/libs/wingsdk/src/target-tf-gcp/function.ts
+++ b/libs/wingsdk/src/target-tf-gcp/function.ts
@@ -208,9 +208,8 @@ export class Function extends cloud.Function {
     lines.push("  res.set('Access-Control-Allow-Methods', 'GET, POST')");
 
     lines.push("  try {");
-    lines.push(
-      `  const result = await (${inflightClient}).handle(req.body ?? "")`
-    );
+    lines.push(`
+      const result = await (${inflightClient}).handle(req.body || undefined)`);
     lines.push(`  res.send(result);`);
     lines.push(`  } catch (error) {`);
     lines.push(`  res.status(500).send(error.message);`);