diff --git a/include/tinycrypt/ecc.h b/include/tinycrypt/ecc.h
index e016c69..d6f2c9d 100644
--- a/include/tinycrypt/ecc.h
+++ b/include/tinycrypt/ecc.h
@@ -428,8 +428,7 @@
  * @param num_words IN -- number of words
  */
 void uECC_vli_modMult(uECC_word_t *result, const uECC_word_t *left,
-		      const uECC_word_t *right, const uECC_word_t *mod,
-	              wordcount_t num_words);
+		      const uECC_word_t *right, const uECC_word_t *mod);
 
 /*
  * @brief Computes (1 / input) % mod