diff --git a/data/calculate b/data/calculate
index 04e09b0..f3cab50 100644
--- a/data/calculate
+++ b/data/calculate
@@ -68,8 +68,11 @@ install_video_driver()
 			;;
 		nvidia)
 			local nvidiamask=`variable_value install.os_nvidia_mask`
-			[[ -n $nvidiamask ]] && \
+			if [[ -n $nvidiamask ]]
+			then
+				[[ -d /etc/portage/package.mask ]] || mkdir /etc/portage/package.mask
 				echo $nvidiamask >/etc/portage/package.mask/nvidia
+			fi
 			local drv="x11-drivers/nvidia-drivers"
 			;;
 		*)