diff --git a/build/build.sh b/build/build.sh
index 7791769..d42daf7 100755
--- a/build/build.sh
+++ b/build/build.sh
@@ -12,7 +12,7 @@ copy()
     cp $@
 }
 
-set -x
+set -ex
 
 export BOOST=$BOOST_ROOT