diff --git a/paddle/phi/kernels/gpu/unique_kernel.cu b/paddle/phi/kernels/gpu/unique_kernel.cu
index 3d44c9af03c07c33593ef583590ce03bcd8cdfbc..9938d949c59c6f61111275968512bad38df48923 100644
--- a/paddle/phi/kernels/gpu/unique_kernel.cu
+++ b/paddle/phi/kernels/gpu/unique_kernel.cu
@@ -333,9 +333,11 @@ static void ComputeUniqueDims(const Context& context,
   // 3. counts: 'counts'
   counts->Resize(phi::make_ddim({num_out}));
   auto* count_data = context.template Alloc<IndexT>(counts);
-  thrust::fill(thrust::device, count_data, count_data + row, 0);
-  thrust::adjacent_difference(
-      thrust::device, range_data_ptr + 1, range_data_ptr + row + 1, count_data);
+  thrust::fill(thrust::device, count_data, count_data + num_out, 0);
+  thrust::adjacent_difference(thrust::device,
+                              range_data_ptr + 1,
+                              range_data_ptr + num_out + 1,
+                              count_data);
 }
 
 // Calculate unique when 'axis' is set