diff --git a/configure b/configure
index 1284263..370b3b1 100755
--- a/configure
+++ b/configure
@@ -399,7 +399,7 @@ config_copy()
 
 	eval sed $mb_sed_substs \
 		$mb_project_dir/Makefile.in    \
-			| sed -e 's/[ \t]*$//g' \
+			| sed -e 's/[[:blank:]]*$//g' \
 			> $mb_pwd/Makefile.tmp
 }
 
diff --git a/sofort/ccenv/ccenv.sh b/sofort/ccenv/ccenv.sh
index 452694d..65a596a 100644
--- a/sofort/ccenv/ccenv.sh
+++ b/sofort/ccenv/ccenv.sh
@@ -955,7 +955,7 @@ ccenv_output_defs()
 		done)"
 
 	eval sed $ccenv_sed_substs $ccenv_in   \
-			| sed -e 's/[ \t]*$//g' \
+			| sed -e 's/[[:blank:]]*$//g' \
 		> "$ccenv_mk"
 
 	if [ "$ccenv_cfgtype" = 'host' ]; then