diff --git a/static/format-chosen.sh b/static/format-chosen.sh
index 923ab591..4046db3c 100644
--- a/static/format-chosen.sh
+++ b/static/format-chosen.sh
@@ -42,7 +42,7 @@ elif [ "$SYSVENDOR" == "Xen" ];
 then
     SYSNAME="Xen/XCP-NG"
     DEVTYPE=xvdb
-elif [ "$SYSVENDOR" == "QEMU" ] | [ "$SYSVENDOR" == "Red Hat" ];
+elif [[ "$SYSVENDOR" == "QEMU" || "$SYSVENDOR" == "Red Hat" ]];
 then
     SYSNAME="KVM/QEMU"
     DEVTYPE=vdb
diff --git a/static/format-sdb.sh b/static/format-sdb.sh
index a55015c5..8a535a08 100644
--- a/static/format-sdb.sh
+++ b/static/format-sdb.sh
@@ -42,7 +42,7 @@ elif [ "$SYSVENDOR" == "Xen" ];
 then
     SYSNAME="Xen/XCP-NG"
     DEVTYPE=xvdb
-elif [ "$SYSVENDOR" == "QEMU" ] | [ "$SYSVENDOR" == "Red Hat" ];
+elif [[ "$SYSVENDOR" == "QEMU" || "$SYSVENDOR" == "Red Hat" ]];
 then
     SYSNAME="KVM/QEMU"
     DEVTYPE=vdb