diff --git a/.drone.yml b/.drone.yml
index a6943df..f924f4b 100644
--- a/.drone.yml
+++ b/.drone.yml
@@ -16,11 +16,11 @@ steps:
   image: leophys/pikaur:0.2
   commands:
   - |
-    if ![ "$(sudo ls -A /cache_stage/lib)" ]; then
+    if ! [ "$(sudo ls -A /cache_stage/lib)" ]; then
       sudo cp -r /var/lib/pacman /drone/lib_pacman
     fi
   - |
-    if ![ "$(sudo ls -A /cache_stage/cache)" ]; then
+    if ! [ "$(sudo ls -A /cache_stage/cache)" ]; then
       sudo cp -r /var/cache/pacman /drone/cache_pacman
     fi
   volumes:
@@ -114,11 +114,11 @@ steps:
   image: leophys/pikaur:0.2
   commands:
   - |
-    if ![ "$(sudo ls -A /cache_stage/lib)" ]; then
+    if ! [ "$(sudo ls -A /cache_stage/lib)" ]; then
       sudo cp -r /var/lib/pacman /drone/lib_pacman
     fi
   - |
-    if ![ "$(sudo ls -A /cache_stage/cache)" ]; then
+    if ! [ "$(sudo ls -A /cache_stage/cache)" ]; then
       sudo cp -r /var/cache/pacman /drone/cache_pacman
     fi
   volumes: