diff --git a/src/TypeDef.h b/src/TypeDef.h
index f82e787b..42334988 100644
--- a/src/TypeDef.h
+++ b/src/TypeDef.h
@@ -553,6 +553,11 @@
 */
 #define RADIOLIB_ERR_A_FCNT_DOWN_INVALID                        (-1114)
 
+/*!
+  \brief Uplink payload length at this datarate exceeds the active dwell time limitations.
+*/
+#define RADIOLIB_ERR_DWELL_TIME_EXCEEDED                        (-1115)
+
 /*!
   \}
 */