diff --git a/src/cli_args/mod.rs b/src/cli_args/mod.rs
index b884939..f80b8cd 100644
--- a/src/cli_args/mod.rs
+++ b/src/cli_args/mod.rs
@@ -245,7 +245,7 @@ pub enum Command {
         #[structopt(long = "dry-run")]
         dry_run: bool,
         /// Pass SSD trim instructions to the underlying block device
-        #[structopt(long = "allow-discards")]
+        #[structopt(long = "allow-discards", env = "FIDO2LUKS_ALLOW_DISCARDS")]
         allow_discards: bool,
     },
     /// Generate a new FIDO credential