diff --git a/spine-ts/spine-phaser-v3/src/SpinePlugin.ts b/spine-ts/spine-phaser-v3/src/SpinePlugin.ts
index a147d6840..01fef7835 100644
--- a/spine-ts/spine-phaser-v3/src/SpinePlugin.ts
+++ b/spine-ts/spine-phaser-v3/src/SpinePlugin.ts
@@ -374,7 +374,9 @@ class SpineAtlasFile extends Phaser.Loader.MultiFile {
 					}
 				}
 
-				let basePath = (file.src.match(/^.*\//) ?? "").toString();
+				let fileUrl = file.url;
+				if (typeof fileUrl === "object") fileUrl = file.src;
+				let basePath = (fileUrl.match(/^.*\//) ?? "").toString();
 				if (this.loader.path && this.loader.path.length > 0 && basePath.startsWith(this.loader.path))
 					basePath = basePath.slice(this.loader.path.length);
 
diff --git a/spine-ts/spine-phaser-v4/src/SpinePlugin.ts b/spine-ts/spine-phaser-v4/src/SpinePlugin.ts
index 2ab8445fa..33f19f26f 100644
--- a/spine-ts/spine-phaser-v4/src/SpinePlugin.ts
+++ b/spine-ts/spine-phaser-v4/src/SpinePlugin.ts
@@ -366,7 +366,9 @@ class SpineAtlasFile extends Phaser.Loader.MultiFile {
 					}
 				}
 
-				let basePath = (file.src.match(/^.*\//) ?? "").toString();
+				let fileUrl = file.url;
+				if (typeof fileUrl === "object") fileUrl = file.src;
+				let basePath = (fileUrl.match(/^.*\//) ?? "").toString();
 				if (this.loader.path && this.loader.path.length > 0 && basePath.startsWith(this.loader.path))
 					basePath = basePath.slice(this.loader.path.length);