diff --git a/source/dub/package_.d b/source/dub/package_.d
index 1abdbb4..d2ccc23 100644
--- a/source/dub/package_.d
+++ b/source/dub/package_.d
@@ -51,7 +51,7 @@
 	{"package.json", PackageFormat.json}
 ];
 
-@property string[] packageInfoFilenames() { return packageInfoFiles.map!(f => f.filename).array; }
+@property string[] packageInfoFilenames() { return packageInfoFiles.map!(f => cast(string)f.filename).array; }
 
 @property string defaultPackageFilename() { return packageInfoFiles[0].filename; }