diff --git a/maint/ioctls_gen.sh b/maint/ioctls_gen.sh
index d8da875..90d7c1f 100755
--- a/maint/ioctls_gen.sh
+++ b/maint/ioctls_gen.sh
@@ -90,7 +90,7 @@
 
 # Output all ioctl definitions fetched from include-directory.
 echo "/* Generated by $me from definitions found in ${inc_dir%%/}/ tree. */" > ioctls_inc.h
-sort -u ioctls_hex.h ioctls_sym.h >> ioctls_inc.h
+LC_COLLATE=C sort -u ioctls_hex.h ioctls_sym.h >> ioctls_inc.h
 msg "generated $(grep -c '^{' ioctls_inc.h) ioctls from $inc_dir"
 
 [ -n "$arch_dir" ] || exit 0
@@ -110,5 +110,5 @@
 
 # Output all ioctl definitions fetched from arch-include-directory.
 echo "/* Generated by $me from definitions found in ${arch_dir%%/}/ tree. */" > ioctls_arch.h
-sort -u ioctls_hex.h ioctls_sym.h >> ioctls_arch.h
+LC_COLLATE=C sort -u ioctls_hex.h ioctls_sym.h >> ioctls_arch.h
 msg "generated $(grep -c '^{' ioctls_arch.h) ioctls from $arch_dir"