diff --git a/include/ring-buffer-iterator.h b/include/ring-buffer-iterator.h
index f17c977..9e207a2 100644
--- a/include/ring-buffer-iterator.h
+++ b/include/ring-buffer-iterator.h
@@ -90,7 +90,7 @@ public:
         return index >= other.index;
     }
 
-    CONSTEXPR friend ring_buffer_iterator operator+( difference_type n, const ring_buffer_iterator& it) NOEXCEPT {
+    CONSTEXPR friend ring_buffer_iterator operator+(difference_type n, const ring_buffer_iterator& it) NOEXCEPT {
         return it + n;
     }
     CONSTEXPR friend void swap(ring_buffer_iterator& a, ring_buffer_iterator& b) COND_NOEXCEPT(noexcept(std::swap(a.container, b.container))) {
@@ -186,7 +186,7 @@ public:
         return index >= other.index;
     }
 
-    CONSTEXPR friend ring_buffer_const_iterator operator+( difference_type n, const ring_buffer_const_iterator& it) NOEXCEPT {
+    CONSTEXPR friend ring_buffer_const_iterator operator+(difference_type n, const ring_buffer_const_iterator& it) NOEXCEPT {
         return it + n;
     }
     CONSTEXPR friend void swap(ring_buffer_const_iterator& a, ring_buffer_const_iterator& b) COND_NOEXCEPT(noexcept(std::swap(a.container, b.container))) {