diff --git a/wolfssl/wolfcrypt/integer.h b/wolfssl/wolfcrypt/integer.h
index 3c8a0020a..3aa808b88 100644
--- a/wolfssl/wolfcrypt/integer.h
+++ b/wolfssl/wolfcrypt/integer.h
@@ -96,6 +96,7 @@ extern "C" {
 #elif defined(MP_16BIT) || defined(NO_64BIT)
    typedef unsigned short     mp_digit;
    typedef unsigned int       mp_word;
+   #define DIGIT_BIT          12 
 #elif defined(MP_64BIT)
    /* for GCC only on supported platforms */
    typedef unsigned long long mp_digit;  /* 64 bit type, 128 uses mode(TI) */