diff --git a/.bashrc b/.bashrc
index f78513d..d12f534 100644
--- a/.bashrc
+++ b/.bashrc
@@ -77,7 +77,7 @@ bind "set completion-ignore-case on"
 # usage: ex <file>
 ex ()
 {
-  if [ -f $1 ] ; then
+  if [ -f "$1" ] ; then
     case $1 in
       *.tar.bz2)   tar xjf $1   ;;
       *.tar.gz)    tar xzf $1   ;;