diff --git a/src/static_queue.h b/src/static_queue.h
index 6fe7552..da1ec1a 100644
--- a/src/static_queue.h
+++ b/src/static_queue.h
@@ -80,8 +80,8 @@
 // Package queue
 typedef enum {
     STATIC_QUEUE_SUCCESS = 0,
-    STATIC_QUEUE_FULL    = -1,
-    STATIC_QUEUE_EMPTY   = -2,
+    STATIC_QUEUE_FULL    = -401,
+    STATIC_QUEUE_EMPTY   = -402,
 } queueErr_t;
 
 typedef struct staticQueueItem staticQueueItem_t;