diff --git a/src/SelectionManager.ts b/src/SelectionManager.ts
index 33853036..11856a92 100644
--- a/src/SelectionManager.ts
+++ b/src/SelectionManager.ts
@@ -266,9 +266,9 @@ export class SelectionManager extends EventEmitter implements ISelectionManager
       return false;
     }
 
-    return (start[1] < coords[1] && end[1] > coords[1]) ||
-        (start[1] === end[1] && start[1] === coords[1] && coords[0] > start[0] && coords[0] < end[0]) ||
-        (start[1] < end[1] && end[1] === coords[1] && coords[0] < end[0]);
+    return (coords[1] > start[1] && coords[1] < end[1]) ||
+        (start[1] === end[1] && coords[1] === start[1] && coords[0] > start[0] && coords[0] < end[0]) ||
+        (start[1] < end[1] && coords[1] === end[1] && coords[0] < end[0]);
   }
 
   /**