diff --git a/podman-matrix/10_install.sh b/podman-matrix/10_install.sh
index b86761c..a328547 100755
--- a/podman-matrix/10_install.sh
+++ b/podman-matrix/10_install.sh
@@ -9,12 +9,12 @@ ensure_not_root
 
 ensure_variables_are_defined "$envvars"
 
-if [[ ! podman volume exists ${confvolume} ]]; then
+if ! podman volume exists ${confvolume} ; then
     echo "Error : conf volume ${confvolume} does not exists. Consider running 05_freshinstall.sh if this is the first install."
     exit 1
 fi
 
-if [[ ! podman volume exists ${dbvolume} ]]; then
+if ! podman volume exists ${dbvolume} ; then
     echo "Error : conf volume ${dbvolume} does not exists. Consider running 05_freshinstall.sh if this is the first install."
     exit 1
 fi