diff --git a/src/index.js b/src/index.js
index 825930a..e007a10 100644
--- a/src/index.js
+++ b/src/index.js
@@ -184,7 +184,7 @@ export default function nodeResolve ( options = {} ) {
 								}
 								fulfil( null );
 							} else if ( jail && resolved.indexOf( normalize( jail.trim( sep ) ) ) !== 0 ) {
-								fulfil( null );
+								fulfil( false );
 							}
 						}
 
diff --git a/test/test.js b/test/test.js
index 47d44b8..96fa306 100644
--- a/test/test.js
+++ b/test/test.js
@@ -557,7 +557,10 @@ describe( 'rollup-plugin-node-resolve', function () {
 			input: 'samples/jail/main.js',
 			plugins: [ nodeResolve({
 				jail: `${__dirname}/samples/`
-			}) ]
+			}) ],
+			onwarn: (err) => {
+				if ( err.code && err.code === 'UNRESOLVED_IMPORT' ) throw err;
+			}
 		}).then( (bundle) => {
 			assert.deepEqual(bundle.imports, [ 'string/uppercase.js' ]);
 		});