diff --git a/tests/test-backend-ops.cpp b/tests/test-backend-ops.cpp
index 7c504e937..1ed74e543 100644
--- a/tests/test-backend-ops.cpp
+++ b/tests/test-backend-ops.cpp
@@ -785,6 +785,10 @@ struct test_cpy : public test_case {
         return VARS_TO_STR3(type_src, type_dst, ne);
     }
 
+    double max_nmse_err() override {
+        return 1e-6;
+    }
+
     size_t op_size(ggml_tensor * t) override {
         return ggml_nbytes(t) + ggml_nbytes(t->src[0]);
     }