diff --git a/include/tinycrypt/ecc.h b/include/tinycrypt/ecc.h
index 74c0960..c4dad0b 100644
--- a/include/tinycrypt/ecc.h
+++ b/include/tinycrypt/ecc.h
@@ -320,8 +320,7 @@
  * @param num_words IN -- number of words
  * @return the sign of left - right
  */
-cmpresult_t uECC_vli_cmp(const uECC_word_t *left, const uECC_word_t *right,
-			 wordcount_t num_words);
+cmpresult_t uECC_vli_cmp(const uECC_word_t *left, const uECC_word_t *right);
 
 /*
  * @brief computes sign of left - right, not in constant time.