diff --git a/conf/mount_disk.sh b/conf/mount_disk.sh
index bcc4d7d..0c09ab1 100755
--- a/conf/mount_disk.sh
+++ b/conf/mount_disk.sh
@@ -1,7 +1,7 @@
 #!/bin/bash
 
-# If we're inside a container
-if systemd-detect-virt -c -q
+# If we're NOT inside a container
+if ! systemd-detect-virt -c -q
 then
     data_dir=__DATA_DIR__
     format=$1