diff --git a/.changelog/25370.txt b/.changelog/25370.txt
new file mode 100644
index 00000000000..466976af1d4
--- /dev/null
+++ b/.changelog/25370.txt
@@ -0,0 +1,3 @@
+```release-note:bug
+resource/aws_appstream_fleet_stack_association: Fix association not being found after creation
+```
diff --git a/internal/service/appstream/fleet_stack_association.go b/internal/service/appstream/fleet_stack_association.go
index 97a2d0c9e5f..915617fdb97 100644
--- a/internal/service/appstream/fleet_stack_association.go
+++ b/internal/service/appstream/fleet_stack_association.go
@@ -66,7 +66,7 @@ func resourceFleetStackAssociationCreate(ctx context.Context, d *schema.Resource
 		return diag.FromErr(fmt.Errorf("error creating AppStream Fleet Stack Association (%s): %w", d.Id(), err))
 	}
 
-	d.SetId(EncodeStackFleetID(d.Get("stack_name").(string), d.Get("fleet_name").(string)))
+	d.SetId(EncodeStackFleetID(d.Get("fleet_name").(string), d.Get("stack_name").(string)))
 
 	return resourceFleetStackAssociationRead(ctx, d, meta)
 }