diff --git a/src/flowtip.js b/src/flowtip.js
index b6f43a6..7df6b9d 100644
--- a/src/flowtip.js
+++ b/src/flowtip.js
@@ -354,12 +354,12 @@ export default class Flowtip extends Component {
 
     // Edge detection - squeeze
     if (
-      (['top', 'bottom'].indexOf !== region) &&
+      (region === 'top' || region === 'bottom') &&
       !regionParameter.top.fits && !regionParameter.bottom.fits
     ) {
       region = this.availableAndFitsIn(['left', 'right'], regionParameter);
     } else if (
-      (['left', 'right'].indexOf !== region) &&
+      (region === 'left' || region === 'right') &&
       !regionParameter.left.fits && !regionParameter.right.fits
     ) {
       region = this.availableAndFitsIn(['top', 'bottom'], regionParameter);
diff --git a/test/spec/flowtip.spec.js b/test/spec/flowtip.spec.js
index 84f0843..2784870 100644
--- a/test/spec/flowtip.spec.js
+++ b/test/spec/flowtip.spec.js
@@ -28,4 +28,29 @@ describe('FlowTip', () => {
     );
     expect(component.text()).to.equal('left');
   });
+
+  it('should edge detect properly', () => {
+    const parent = {left: 0, top: 0, width: 300, height: 300};
+    const anchor = parent;
+    const tail = {width: 50, height: 50};
+    const content = {width: 150, height: 100};
+    const region = 'top';
+    const offset = {left: 0, top: 0};
+    const target = {left: 150, top: 50, width: 50, height: 50};
+    const component = shallow(
+      <FlowTip
+        parent={parent}
+        anchor={anchor}
+        tail={tail}
+        content={content}
+        region={region}
+        offset={offset}
+        target={target}
+        children={({region}) =>
+          <div>{region}</div>
+        }
+      />
+    );
+    expect(component.text()).to.equal('bottom');
+  });
 });