diff --git a/Makefile b/Makefile
index eb34ed9..e41271a 100644
--- a/Makefile
+++ b/Makefile
@@ -1,7 +1,7 @@
 
 #!/bin/sh
 
-build_root=$(`sh pwd`)
+build_root=$(pwd)
 project=ems
 # os platform
 platform=ub22