diff --git a/build.sh b/build.sh
index b2c3049..5a78fa0 100755
--- a/build.sh
+++ b/build.sh
@@ -39,7 +39,7 @@ do
 			mysql -h db -utest -ptest123 sage < mysql.ddl.sql
 		fi
 	fi
-	$cdir/pkgs/$m
+	cd $cdir/pkgs/$m
 	$cdir/py3/bin/pip install .
 	if [ -d $cdir/pkgs/$m/json ];then
 		cd $cdir/pkgs/$m/json