diff --git a/src/scripts/xzdiff.in b/src/scripts/xzdiff.in
index 3c09ad02..fc1e0575 100644
--- a/src/scripts/xzdiff.in
+++ b/src/scripts/xzdiff.in
@@ -83,11 +83,11 @@ if test $# -eq 1; then
   esac
   case $1 in
     *[-.][zZ] | *_z | *[-.][gx]z | *[-.]bz2 | *[-.]lzma)
-      FILE=`expr "X$1" : 'X\(.*\)[-.][abglmxzZ2]*$'`
+      FILE=`expr "X$1" : 'X\(.*\)[-.][abglmxzZ2]*$'`;;
     *.t[abglx]z)
-      FILE=`expr "X$1" : 'X\(.*[-.]t\)[abglx]z$'`ar
+      FILE=`expr "X$1" : 'X\(.*[-.]t\)[abglx]z$'`ar;;
     *.tbz2)
-      FILE=`expr "X$1" : 'X\(.*[-.]t\)bz2$'`ar
+      FILE=`expr "X$1" : 'X\(.*[-.]t\)bz2$'`ar;;
   esac
   xz_status=$(
     exec 4>&1