diff --git a/scripts/gen_build_files.sh b/scripts/gen_build_files.sh
index e8fa831be..ebee17c64 100755
--- a/scripts/gen_build_files.sh
+++ b/scripts/gen_build_files.sh
@@ -71,7 +71,7 @@ sed -n -e 's@^//usage:\([ '"$TAB"'].*\)$@\1 \\@p' \
 
 # (Re)generate */Kbuild and */Config.in
 # We skip .dotdirs - makes git/svn/etc users happier
-{ cd -- "$srctree" && find . -type d -not '(' -name '.?*' -prune ')'; } \
+{ cd -- "$srctree" && find . -type d ! '(' -name '.?*' -prune ')'; } \
 | while read -r d; do
 	d="${d#./}"