diff --git a/.drone.yml b/.drone.yml
index 35315e9..6f867fc 100644
--- a/.drone.yml
+++ b/.drone.yml
@@ -8,7 +8,7 @@ platform:
 
 steps:
 - name: build
-  image: cppbuilder:v0.3
+  image: cppbuilder:v0.4
   commands:
   - cd mario
   - mkdir build
@@ -25,10 +25,10 @@ platform:
 
 steps:
 - name: formatting-check
-  image: cppbuilder:v0.3
+  image: cppbuilder:v0.4
   commands:
   - cd mario
   - FORMAT="ok"
-  - while read f ; do clang-format -style=file "$f" > temp.pp ; if [ $(diff temp.pp "$f" | wc -l) -gt 0 ] ; then echo "$f needs reformatting" ; FORMAT="nok" ; fi ; done <<< $(find . -iname "*pp")
+  - while read f ; do clang-format -style=file "$f" > temp.pp ; if [ $(diff temp.pp "$f" | wc -l) -gt 0 ] ; then echo "$f needs reformatting" ; FORMAT="nok" ; fi ; done <<< "$(find . -iname '*pp')"
   - rm temp.pp
   - if [ "$FORMAT" == "nok" ] ; then exit 1 ; fi