diff --git a/src/constructs/autoscaling/asg.test.ts b/src/constructs/autoscaling/asg.test.ts
index 07bc8180a9..a5db346684 100644
--- a/src/constructs/autoscaling/asg.test.ts
+++ b/src/constructs/autoscaling/asg.test.ts
@@ -5,6 +5,7 @@ import { ApplicationProtocol } from "@aws-cdk/aws-elasticloadbalancingv2";
 import { Stack } from "@aws-cdk/core";
 import { simpleGuStackForTesting } from "../../../test/utils/simple-gu-stack";
 import type { SynthedStack } from "../../../test/utils/synthed-stack";
+import { GuAmiParameter } from "../core";
 import { GuSecurityGroup } from "../ec2";
 import { GuApplicationTargetGroup } from "../loadbalancing";
 import type { GuAutoScalingGroupProps } from "./asg";
@@ -43,14 +44,21 @@ describe("The GuAutoScalingGroup", () => {
   test("does not add the AMI parameter if an imageId prop provided", () => {
     const stack = simpleGuStackForTesting();
 
-    new GuAutoScalingGroup(stack, "AutoscalingGroup", { ...defaultProps, osType: 1, imageId: "123" });
+    new GuAutoScalingGroup(stack, "AutoscalingGroup", {
+      ...defaultProps,
+      osType: 1,
+      imageId: new GuAmiParameter(stack, "CustomAMI", {}),
+    });
 
     const json = SynthUtils.toCloudFormation(stack) as SynthedStack;
 
     expect(Object.keys(json.Parameters)).not.toContain("AMI");
+    expect(Object.keys(json.Parameters)).toContain("CustomAMI");
 
     expect(stack).toHaveResource("AWS::AutoScaling::LaunchConfiguration", {
-      ImageId: "123",
+      ImageId: {
+        Ref: "CustomAMI",
+      },
     });
   });
 
diff --git a/src/constructs/autoscaling/asg.ts b/src/constructs/autoscaling/asg.ts
index d3180acbdc..ffc878ddf7 100644
--- a/src/constructs/autoscaling/asg.ts
+++ b/src/constructs/autoscaling/asg.ts
@@ -12,7 +12,7 @@ import { GuAmiParameter, GuInstanceTypeParameter } from "../core";
 export interface GuAutoScalingGroupProps
   extends Omit<AutoScalingGroupProps, "imageId" | "osType" | "machineImage" | "instanceType" | "userData"> {
   instanceType?: InstanceType;
-  imageId?: string;
+  imageId?: GuAmiParameter;
   osType?: OperatingSystemType;
   machineImage?: MachineImage;
   userData: string;
@@ -31,7 +31,7 @@ export class GuAutoScalingGroup extends AutoScalingGroup {
         osType: props.osType ?? OperatingSystemType.LINUX,
         userData: UserData.custom(props.userData),
         imageId:
-          props.imageId ??
+          props.imageId?.valueAsString ??
           new GuAmiParameter(scope, "AMI", {
             description: "AMI ID",
           }).valueAsString,