diff --git a/modules/core/include/opencv2/core/operations.hpp b/modules/core/include/opencv2/core/operations.hpp
index 0ae51c6939..076a5e467d 100644
--- a/modules/core/include/opencv2/core/operations.hpp
+++ b/modules/core/include/opencv2/core/operations.hpp
@@ -2558,10 +2558,10 @@ template<typename _Tp, size_t fixed_size> inline void AutoBuffer<_Tp, fixed_size
     if(_size <= size)
         return;
     deallocate();
+    size = _size;
     if(_size > fixed_size)
     {
         ptr = cv::allocate<_Tp>(_size);
-        size = _size;
     }
 }