diff --git a/mean_shift_cuda/meanshift_gpu_utils.cu b/mean_shift_cuda/meanshift_gpu_utils.cu
index 7c444bd..58fd600 100644
--- a/mean_shift_cuda/meanshift_gpu_utils.cu
+++ b/mean_shift_cuda/meanshift_gpu_utils.cu
@@ -9,6 +9,9 @@
 
 cudaDeviceProp device_properties;
 
+struct timeval startwtime, endwtime;
+double seq_time;
+
 //Based on https://stackoverflow.com/a/28113186
 //Pio psagmeno link https://www.cs.virginia.edu/~csadmin/wiki/index.php/CUDA_Support/Choosing_a_GPU
 void set_GPU(){