diff --git a/sofort/ccenv/ccenv.sh b/sofort/ccenv/ccenv.sh
index f996333..a956425 100644
--- a/sofort/ccenv/ccenv.sh
+++ b/sofort/ccenv/ccenv.sh
@@ -1254,7 +1254,7 @@ ccenv_output_defs()
 		ccenv_tmp=$(mktemp ./tmp_XXXXXXXXXXXXXXXX)
 
 		sed                             \
-				-e 's/^\s*$/@/g' \
+				-e 's/^[[:space:]]*$/@/g' \
 				-e 's/^/NATIVE_/' \
 				-e 's/NATIVE_@//g' \
 				-e 's/NATIVE_#/#/g' \