diff --git a/source/libs/array/array/swap-global.rst b/source/libs/array/array/swap-global.rst
index 774a6c8c..418bb143 100644
--- a/source/libs/array/array/swap-global.rst
+++ b/source/libs/array/array/swap-global.rst
@@ -33,7 +33,7 @@ Examples
   auto x = array<int, 10>{{1, 2, 3, 4, 5, 6, 7, 8, 9, 10}};
   auto y = array<int, 10>{{10, 9, 8, 7, 6, 5, 4, 3, 2, 1}};
   swap(x, y);
-  SPROUT_ASSERT_MSG(x[0] = 10 && y[0] == 1, "each element are swapped.");
+  SPROUT_ASSERT_MSG(x[0] == 10 && y[0] == 1, "each element are swapped.");
 
 Complexity
 ========================================