diff --git a/configure b/configure
index 709f593..f8619a3 100755
--- a/configure
+++ b/configure
@@ -5,7 +5,7 @@
 fn_dirname()
 {
   case $1 in
-    */*) echo "$1" | sed -e 's,/[^/]*,,';;
+    */*) echo ${1%/*};;
       *) echo '.'
   esac
 }