diff --git a/lib/core.sh b/lib/core.sh
index 061beaf..e6a5481 100644
--- a/lib/core.sh
+++ b/lib/core.sh
@@ -176,7 +176,7 @@ function _run_proot(){
 
 
 function _run_juju_with_proot(){
-    [ "$(_run_proot ${ID} 2> /dev/null )" == "0" ] && \
+    [ "$(_run_proot "" ${ID} 2> /dev/null )" == "0" ] && \
         die "You cannot access with root privileges. Use --root option instead."
 
     _run_proot "${@}"
diff --git a/tests/test_core.sh b/tests/test_core.sh
index 6dc4705..035e9f9 100755
--- a/tests/test_core.sh
+++ b/tests/test_core.sh
@@ -24,6 +24,8 @@ function set_up(){
 
 
 function tear_down(){
+    # the CA directories are read only and can be deleted only by changing the mod
+    [ -d ${JUJU_HOME}/etc/ca-certificates ] && chmod -R +w ${JUJU_HOME}/etc/ca-certificates
     rm -rf $JUJU_HOME
     rm -rf $ORIGIN_WD
     rm -rf $JUJU_TEMPDIR