diff --git a/include/range.h b/include/range.h
index f0baf38..33c7afa 100644
--- a/include/range.h
+++ b/include/range.h
@@ -36,8 +36,8 @@ class Range {
         const pointer operator->() { return &value_; }
         bool operator==(const iterator& rhs) { return positive_step_ ? (value_ >= rhs.value_ && value_ > boundary_)
                                                                      : (value_ <= rhs.value_ && value_ < boundary_); }
-        bool operator!=(const iterator& rhs) { return positive_step_ ? (value_ < rhs.value_ && value_ > boundary_)
-                                                                     : (value_ > rhs.value_ && value_ < boundary_); }
+        bool operator!=(const iterator& rhs) { return positive_step_ ? (value_ < rhs.value_ && value_ >= boundary_)
+                                                                     : (value_ > rhs.value_ && value_ <= boundary_); }
         
       private:
         value_type value_;