diff --git a/src/app/definition.h b/src/app/definition.h
index 8a7828d..55ef94f 100644
--- a/src/app/definition.h
+++ b/src/app/definition.h
@@ -48,7 +48,7 @@ typedef struct viewLink{
     boolean (*viewLogicFunction)(Adafruit_SSD1306&, void*);
     void *pData;
     const int UID;
-    struct viewLink *next;
+    struct viewLink *next, *previous;
 } ViewLink, *ViewLinkedList;
 
 char *addChar(char *pointer, const char character);