diff --git a/include/tinycrypt/ecc.h b/include/tinycrypt/ecc.h
index 50d93d2..ba5dffc 100644
--- a/include/tinycrypt/ecc.h
+++ b/include/tinycrypt/ecc.h
@@ -453,8 +453,7 @@
  * @param src IN --  origin buffer
  * @param num_words IN -- number of words
  */
-void uECC_vli_set(uECC_word_t *dest, const uECC_word_t *src,
-		  wordcount_t num_words);
+void uECC_vli_set(uECC_word_t *dest, const uECC_word_t *src);
 
 /*
  * @brief Computes (left + right) % mod.