diff --git a/modules/dnn/src/op_cuda.hpp b/modules/dnn/src/op_cuda.hpp
index 44e4955c50..880ed71634 100644
--- a/modules/dnn/src/op_cuda.hpp
+++ b/modules/dnn/src/op_cuda.hpp
@@ -305,6 +305,10 @@ namespace cv { namespace dnn {
             shape = shape_;
             offset = 0;
             shared_block = base->shared_block;
+
+            auto numel = total(shape_);
+            if (numel > shared_block->device.size())
+                shared_block->device.reset(numel);
         }
 
         static Ptr<BackendWrapper> create(Mat& m) {