diff --git a/sys/include/net/loramac.h b/sys/include/net/loramac.h
index 8b91c12fa53089c31d8eea2d49e125dff0c6a74f..60153b0995b4fd177be32cf054a45b49b57398d8 100644
--- a/sys/include/net/loramac.h
+++ b/sys/include/net/loramac.h
@@ -181,16 +181,16 @@ extern "C" {
 #endif
 
 /**
- * @brief   Default first RX window delay (in s)
+ * @brief   Default first RX window delay (in ms)
  */
 #ifndef LORAMAC_DEFAULT_RX1_DELAY
-#define LORAMAC_DEFAULT_RX1_DELAY      (1U)
+#define LORAMAC_DEFAULT_RX1_DELAY      (1000U)
 #endif
 
 /**
- * @brief   Default first RX window delay (in s)
+ * @brief   Default second RX window delay (in ms)
  */
-#define LORAMAC_DEFAULT_RX2_DELAY      (1U + LORAMAC_DEFAULT_RX1_DELAY)
+#define LORAMAC_DEFAULT_RX2_DELAY      (1000U + LORAMAC_DEFAULT_RX1_DELAY)
 
 /**
  * @brief   Default automatic reply status