diff --git a/test/sourcemaps/loaders/_config.js b/test/sourcemaps/loaders/_config.js
index cf13906..d278904 100644
--- a/test/sourcemaps/loaders/_config.js
+++ b/test/sourcemaps/loaders/_config.js
@@ -10,20 +10,26 @@ module.exports = {
 		plugins: [
 			{
 				load: function ( id ) {
-					if ( id.endsWith( 'main.js' ) ) {
-						id = id.replace( /main.js$/, 'foo.js' );
-					} else {
-						id = id.replace( /foo.js$/, 'main.js' );
+					if ( id.endsWith( 'foo.js' ) ) {
+						id = id.replace( /foo.js$/, 'bar.js' );
+					} else if ( id.endsWith( 'bar.js' ) ) {
+						id = id.replace( /bar.js$/, 'foo.js' );
 					}
 
 					var out = babel.transformFileSync( id, {
 						blacklist: [ 'es6.modules' ],
-						sourceMap: true
+						sourceMap: true,
+						comments: false // misalign the columns
 					});
 
-					const slash = out.map.sources[0].lastIndexOf( '/' ) + 1;
-					out.map.sources = out.map.sources.map( source => '../' + source.slice( slash ) );
-					out.map.sourceRoot = 'fake';
+					if ( id.endsWith( 'main.js' ) ) {
+						delete out.map.sources;
+						//throw new Error(JSON.stringify(out.code));
+					} else {
+						const slash = out.map.sources[0].lastIndexOf( '/' ) + 1;
+						out.map.sources = out.map.sources.map( source => '../' + source.slice( slash ) );
+						out.map.sourceRoot = 'fake';
+					}
 
 					return { code: out.code, map: out.map };
 				}
@@ -33,18 +39,26 @@ module.exports = {
 	test: function ( code, map ) {
 		var smc = new SourceMapConsumer( map );
 
-		var generatedLoc = getLocation( code, code.indexOf( '42' ) );
+		var generatedLoc = getLocation( code, code.indexOf( '22' ) );
 		var originalLoc = smc.originalPositionFor( generatedLoc );
 
-		assert.equal( originalLoc.source, '../main.js' );
+		assert.equal( originalLoc.source, '../foo.js' );
 		assert.equal( originalLoc.line, 1 );
-		assert.equal( originalLoc.column, 25 );
+		assert.equal( originalLoc.column, 32 );
+
+		var generatedLoc = getLocation( code, code.indexOf( '20' ) );
+		var originalLoc = smc.originalPositionFor( generatedLoc );
+
+		assert.equal( originalLoc.source, '../bar.js' );
+		assert.equal( originalLoc.line, 1 );
+		assert.equal( originalLoc.column, 37 );
 
 		generatedLoc = getLocation( code, code.indexOf( 'log' ) );
 		originalLoc = smc.originalPositionFor( generatedLoc );
 
-		assert.equal( originalLoc.source, '../foo.js' );
-		assert.equal( originalLoc.line, 3 );
-		assert.equal( originalLoc.column, 8 );
+		assert.equal( originalLoc.source, '../main.js' );
+		assert.ok( /columns/.test( smc.sourceContentFor( '../main.js' ) ) );
+		assert.equal( originalLoc.line, 4 );
+		assert.equal( originalLoc.column, 19 );
 	}
 };
diff --git a/test/sourcemaps/loaders/bar.js b/test/sourcemaps/loaders/bar.js
new file mode 100644
index 0000000..6c3e77f
--- /dev/null
+++ b/test/sourcemaps/loaders/bar.js
@@ -0,0 +1 @@
+/*misalign*/export const foo = () => 20;
diff --git a/test/sourcemaps/loaders/foo.js b/test/sourcemaps/loaders/foo.js
index c0b4c17..9ce4283 100644
--- a/test/sourcemaps/loaders/foo.js
+++ b/test/sourcemaps/loaders/foo.js
@@ -1,3 +1 @@
-import { foo } from './foo';
-
-console.log( `the answer is ${foo()}` );
+/*the*/export const bar = () => 22;
diff --git a/test/sourcemaps/loaders/main.js b/test/sourcemaps/loaders/main.js
index 0cf01be..df7e27a 100644
--- a/test/sourcemaps/loaders/main.js
+++ b/test/sourcemaps/loaders/main.js
@@ -1 +1,4 @@
-export const foo = () => 42;
+import { foo } from './foo';
+import { bar } from './bar';
+
+/*columns*/console.log( `the answer is ${foo() + bar()}` );