diff --git a/src/index.test.ts b/src/index.test.ts
index eef2325b..e69e7164 100644
--- a/src/index.test.ts
+++ b/src/index.test.ts
@@ -33,11 +33,11 @@ test.each([
     {
       apiKey: "foo",
       version: "weekly",
-      libraries: ["places"],
+      libraries: ["marker", "places"],
       language: "language",
       region: "region",
     },
-    "https://maps.googleapis.com/maps/api/js?callback=__googleMapsCallback&key=foo&libraries=places&language=language&region=region&v=weekly",
+    "https://maps.googleapis.com/maps/api/js?callback=__googleMapsCallback&key=foo&libraries=marker,places&language=language&region=region&v=weekly",
   ],
   [
     { mapIds: ["foo", "bar"] },
diff --git a/src/index.ts b/src/index.ts
index 47fc99b0..c7b21601 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -31,6 +31,7 @@ export type Libraries = (
   | "drawing"
   | "geometry"
   | "localContext"
+  | "marker"
   | "places"
   | "visualization"
 )[];