diff --git a/build-cmtk.sh b/build-cmtk.sh
index a47aeb65..e7891860 100755
--- a/build-cmtk.sh
+++ b/build-cmtk.sh
@@ -3,8 +3,9 @@ set -e
 # check to see if cmtk install folder is empty
 if [ ! -d "$HOME/usr/local/bin" ]; then
   mkdir -p $HOME/src && cd $HOME/src
-  git clone --depth 50 https://github.com/jefferis/cmtk@natdev
-  cd cmtk/core && mkdir build && cd build && cmake .. && make DESTDIR=$HOME/ all install
+  git clone --depth 50 https://github.com/jefferis/cmtk
+  cd cmtk && git checkout natdev
+  cd core && mkdir build && cd build && cmake .. && make DESTDIR=$HOME/ all install
 else
   echo 'Using cached $HOME/usr/local directory.';
 fi