diff --git a/urchin b/urchin
index 6a50b36..8cd1c4c 100755
--- a/urchin
+++ b/urchin
@@ -33,7 +33,9 @@ stdout_file() {
 }
 
 # Expand relative paths
-alias fullpath='readlink -f --'
+fullpath() {
+  readlink -f -- "$1"
+}
 
 remove_trailing_slash() {
   echo "$1" | sed s/\\/$//