diff --git a/source/dub/commandline.d b/source/dub/commandline.d
index 76aa868..9c6702c 100644
--- a/source/dub/commandline.d
+++ b/source/dub/commandline.d
@@ -229,10 +229,11 @@
 					// should simply retry over all registries instead of using a special
 					// FallbackPackageSupplier.
 					auto urls = url.splitter(' ');
-					auto ps = new RegistryPackageSupplier(URL(urls.front));
+					PackageSupplier ps = new RegistryPackageSupplier(URL(urls.front));
 					urls.popFront;
 					if (!urls.empty)
-						ps = new FallbackPackageSupplier(ps, urls.map!(u => new RegistryPackageSupplier(URL(u))).array);
+						ps = new FallbackPackageSupplier(ps,
+							urls.map!(u => cast(PackageSupplier) new RegistryPackageSupplier(URL(u))).array);
 					return ps;
 				})
 				.array;
diff --git a/test/fetchzip.sh b/test/fetchzip.sh
index 05c3a98..f32cd04 100755
--- a/test/fetchzip.sh
+++ b/test/fetchzip.sh
@@ -44,3 +44,9 @@
     die 'DUB should not have installed a package.'
 fi
 
+echo "HTTP status errors on downloads should retry with fallback mirror - gitcompatibledubpackage (1.0.2)"
+timeout 1s "$DUB" fetch gitcompatibledubpackage --version=1.0.2 --skip-registry=all --registry="http://localhost:$PORT http://localhost:$PORT/fallback"
+if [ $? -eq 124 ]; then
+    die 'Fetching from responsive registry should not time-out.'
+fi
+dub remove gitcompatibledubpackage --non-interactive --version=1.0.2
diff --git a/test/test_registry.d b/test/test_registry.d
index 4e10024..625ff03 100644
--- a/test/test_registry.d
+++ b/test/test_registry.d
@@ -17,6 +17,7 @@
 		res.writeBody("", HTTPStatus.badGateway);
 	});
 	router.get("*", folder.serveStaticFiles);
+	router.get("/fallback/*", folder.serveStaticFiles(new HTTPFileServerSettings("/fallback")));
 	listenHTTP(text(":", port), router);
 	runApplication();
 }