diff --git a/kas-docker b/kas-docker
index ceaf188..cbbd378 100755
--- a/kas-docker
+++ b/kas-docker
@@ -66,8 +66,17 @@ while [ $# -gt 0 ]; do
 				echo "Error: loop device not available!"
 				exit 1
 			fi
-			echo "Setting up loop device requires root privileges"
-			LOOP_DEV=$(sudo /sbin/losetup -f)
+			sudo_command="/sbin/losetup -f"
+			sudo_message="[sudo] enter password to setup loop"
+			sudo_message="$sudo_message devices by calling"
+			sudo_message="$sudo_message '$sudo_command': " 
+			if ! LOOP_DEV=$(sudo -p "$sudo_message" $sudo_command \
+				2>/dev/null); then
+				echo "Error: loop device setup unsuccessful!"
+				echo "try calling '$sudo_command' with root" \
+					"permissions manually."
+				exit 1
+			fi
 		fi
 		ISAR_ARGS="--cap-add=SYS_ADMIN --cap-add=MKNOD --privileged \
 			--device ${LOOP_DEV}"