diff --git a/clients/screenshot.c b/clients/screenshot.c
index 7395bf3f..0fa4e4b7 100644
--- a/clients/screenshot.c
+++ b/clients/screenshot.c
@@ -205,6 +205,12 @@ set_buffer_size(int *width, int *height)
 	struct screenshooter_output *output;
 	min_x = min_y = INT_MAX;
 	max_x = max_y = INT_MIN;
+	int position = 0;
+
+	wl_list_for_each_reverse(output, &output_list, link) {
+		output->offset_x = position;
+		position += output->width;
+	}
 
 	wl_list_for_each(output, &output_list, link) {
 		min_x = MIN(min_x, output->offset_x);