diff --git a/CUDA/xfibres_gpu.cuh b/CUDA/xfibres_gpu.cuh
index 08c6a2410a864d08c7cdb0718563cf92a87f858c..9cdf86896098a51de364b0212886dcc3a8b9050d 100644
--- a/CUDA/xfibres_gpu.cuh
+++ b/CUDA/xfibres_gpu.cuh
@@ -71,6 +71,7 @@ void mix_params(	//INPUT
 			thrust::device_vector<double>   		params_repeat_gpu,
 			thrust::host_vector<int>			vox_repeat,
 			int						nrepeat,
+			int						nvox,
 			//INPUT-OUTPUT
 			thrust::device_vector<double>&   		params_gpu);