diff --git a/x-pack/plugins/maps/public/classes/sources/setup_sources.ts b/x-pack/plugins/maps/public/classes/sources/setup_sources.ts
index 846a51c202bc7..91e2f241ed83b 100644
--- a/x-pack/plugins/maps/public/classes/sources/setup_sources.ts
+++ b/x-pack/plugins/maps/public/classes/sources/setup_sources.ts
@@ -19,7 +19,7 @@ import { MVTSingleLayerVectorSource } from './mvt_single_layer_vector_source';
 import { WMSSource } from './wms_source';
 import { XYZTMSSource } from './xyz_tms_source';
 
-const registered = false;
+let registered = false;
 
 export function setupSources() {
   if (registered) {