diff --git a/src/alignString.js b/src/alignString.js
index f0383ff..3e24fb5 100644
--- a/src/alignString.js
+++ b/src/alignString.js
@@ -35,7 +35,7 @@ const alignCenter = (subject, width) => {
 
   halfWidth = width / 2;
 
-  if (halfWidth % 2 === 0) {
+  if (width % 2 === 0) {
     return ' '.repeat(halfWidth) + subject + ' '.repeat(halfWidth);
   } else {
     halfWidth = Math.floor(halfWidth);
diff --git a/test/alignString.js b/test/alignString.js
index eb57893..045a15a 100644
--- a/test/alignString.js
+++ b/test/alignString.js
@@ -64,7 +64,7 @@ describe('alignString', () => {
         });
         context('center', () => {
           it('pads the string on both sides using a whitespace character', () => {
-            expect(alignString('aa', 6, 'center')).to.equal('  aa  ');
+            expect(alignString('aa', 8, 'center')).to.equal('   aa   ');
           });
           context('uneven number of available with', () => {
             it('floors the available width; adds extra space to the end of the string', () => {