diff --git a/source/dub/packagemanager.d b/source/dub/packagemanager.d
index 27405b5..134eade 100644
--- a/source/dub/packagemanager.d
+++ b/source/dub/packagemanager.d
@@ -224,7 +224,7 @@
 		foreach (p; getPackageIterator(base_package.name~":"~sub_name))
 			if (p.parentPackage is base_package)
 				return p;
-		enforce(silent_fail, "Sub package "~base_package.name~":"~sub_name~" doesn't exist.");
+		enforce(silent_fail, "Sub package \""~base_package.name~":"~sub_name~"\" doesn't exist.");
 		return null;
 	}