diff --git a/modules/core/include/opencv2/core/operations.hpp b/modules/core/include/opencv2/core/operations.hpp
index 0d0f7c7..3988e96 100644
--- a/modules/core/include/opencv2/core/operations.hpp
+++ b/modules/core/include/opencv2/core/operations.hpp
@@ -2554,7 +2554,7 @@ AutoBuffer<_Tp, fixed_size>::AutoBuffer(const AutoBuffer<_Tp, fixed_size>& abuf
 {
     ptr = buf;
     sz = fixed_size;
-    allocate(abuf.size);
+    allocate(abuf.size.size());
     for( size_t i = 0; i < sz; i++ )
         ptr[i] = abuf.ptr[i];
 }
@@ -2565,7 +2565,7 @@ AutoBuffer<_Tp, fixed_size>::operator = (const AutoBuffer<_Tp, fixed_size>& abuf
     if( this != &abuf )
     {
         deallocate();
-        allocate(abuf.size);
+        allocate(abuf.size());
         for( size_t i = 0; i < sz; i++ )
             ptr[i] = abuf.ptr[i];
     }