diff --git a/drivers/at/at.c b/drivers/at/at.c
index b8883cdb6b..7471667f2a 100644
--- a/drivers/at/at.c
+++ b/drivers/at/at.c
@@ -25,11 +25,11 @@
 #endif
 
 #if defined(MODULE_AT_URC_ISR_LOW)
-#define AT_EVENT_PRIO EVENT_PRIO_LOW
+#define AT_EVENT_PRIO EVENT_PRIO_LOWEST
 #elif defined(MODULE_AT_URC_ISR_MEDIUM)
 #define AT_EVENT_PRIO EVENT_PRIO_MEDIUM
-#elif defined(MODULE_AT_URC_ISR_HIGH)
-#define AT_EVENT_PRIO EVENT_PRIO_HIGH
+#elif defined(MODULE_AT_URC_ISR_HIGHEST)
+#define AT_EVENT_PRIO EVENT_PRIO_HIGHEST
 #endif
 
 #if defined(MODULE_AT_URC_ISR)