diff --git a/sys/boot/ficl/ficl.h b/sys/boot/ficl/ficl.h
index 7892ee963d7f..6fe9e10aba20 100644
--- a/sys/boot/ficl/ficl.h
+++ b/sys/boot/ficl/ficl.h
@@ -757,6 +757,7 @@ void        dictAppendUNS  (FICL_DICT *pDict, FICL_UNS u);
 int         dictCellsAvail (FICL_DICT *pDict);
 int         dictCellsUsed  (FICL_DICT *pDict);
 void        dictCheck      (FICL_DICT *pDict, FICL_VM *pVM, int n);
+void        dictCheckThreshold(FICL_DICT* dp);
 FICL_DICT  *dictCreate(unsigned nCELLS);
 FICL_DICT  *dictCreateHashed(unsigned nCells, unsigned nHash);
 FICL_HASH  *dictCreateWordlist(FICL_DICT *dp, int nBuckets);