diff --git a/modules/dnn/src/layers/convolution_layer.cpp b/modules/dnn/src/layers/convolution_layer.cpp
index 057cdf4b73..50b84f7776 100644
--- a/modules/dnn/src/layers/convolution_layer.cpp
+++ b/modules/dnn/src/layers/convolution_layer.cpp
@@ -644,7 +644,7 @@ public:
         {
             // prepare weightsMat where each row is aligned and has enough zero padding on the right to
             // use vectorized (i.e. with intrinsics) loops without tail processing
-            Mat wm = blobs[0].reshape(1, outCn);
+            Mat wm = blobs[0].reshape(1, outCn).clone();
             if( wm.step1() % VEC_ALIGN != 0 )
             {
                 int newcols = (int)alignSize(wm.step1(), VEC_ALIGN);