diff --git a/components/esp_hw_support/include/esp_intr_alloc.h b/components/esp_hw_support/include/esp_intr_alloc.h
index e60b841988..c9b1eafb86 100644
--- a/components/esp_hw_support/include/esp_intr_alloc.h
+++ b/components/esp_hw_support/include/esp_intr_alloc.h
@@ -305,7 +305,7 @@ void esp_intr_disable_source(int inum);
  */
 static inline int esp_intr_flags_to_level(int flags)
 {
-    return __builtin_ffs((flags & ESP_INTR_FLAG_LEVELMASK) >> 1) + 1;
+    return __builtin_ffs((flags & ESP_INTR_FLAG_LEVELMASK) >> 1);
 }
 
 /**