diff --git a/openpgp-card/src/apdu/mod.rs b/openpgp-card/src/apdu/mod.rs
index d82723b..760ab87 100644
--- a/openpgp-card/src/apdu/mod.rs
+++ b/openpgp-card/src/apdu/mod.rs
@@ -183,6 +183,14 @@ fn send_command_low_level(
     } else {
         let serialized = cmd.serialize(ext)?;
 
+        // Can't send this command to the card, because it is too long and
+        // the card doesn't support command chaining.
+        if serialized.len() > max_cmd_bytes {
+            return Err(OpenpgpCardError::CommandTooLong(serialized.len()));
+        }
+
+        log::debug!(" -> APDU command: {:x?}", &serialized);
+
         let resp = card_client.transmit(&serialized, buf_size)?;
 
         log::debug!(" <- APDU response: {:x?}", resp);
diff --git a/openpgp-card/src/errors.rs b/openpgp-card/src/errors.rs
index 61b7ff4..cd1773b 100644
--- a/openpgp-card/src/errors.rs
+++ b/openpgp-card/src/errors.rs
@@ -11,6 +11,9 @@ pub enum OpenpgpCardError {
     #[error("OpenPGP card error status {0}")]
     OcStatus(OcErrorStatus),
 
+    #[error("Command too long ({0} bytes)")]
+    CommandTooLong(usize),
+
     #[error("Internal error {0}")]
     InternalError(anyhow::Error),
 }