diff --git a/fft/ifft_mfa_truncate_sqrt2.c b/fft/ifft_mfa_truncate_sqrt2.c
index 3f3b52e9..09ef2e1f 100644
--- a/fft/ifft_mfa_truncate_sqrt2.c
+++ b/fft/ifft_mfa_truncate_sqrt2.c
@@ -114,7 +114,7 @@ void ifft_truncate1_twiddle(mp_limb_t ** ii, mp_size_t is,
 
       for (i = 0; i < trunc; i++)
       {
-#if HAVE_ADDSUB_N
+#if  HAVE_NATIVE_mpn_addsub_n
          mpn_addsub_n(ii[i*is], ii[i*is], ii[i*is], ii[(n+i)*is], limbs + 1);
 #else
          mpn_add_n(ii[i*is], ii[i*is], ii[i*is], limbs + 1);
diff --git a/fft/ifft_truncate.c b/fft/ifft_truncate.c
index 3022d816..74171c1e 100644
--- a/fft/ifft_truncate.c
+++ b/fft/ifft_truncate.c
@@ -51,7 +51,7 @@ void ifft_truncate1(mp_limb_t ** ii, mp_size_t n, mp_bitcnt_t w,
 
         for (i = 0; i < trunc; i++)
         {
-#if HAVE_ADDSUB_N
+#if  HAVE_NATIVE_mpn_addsub_n
             mpn_addsub_n(ii[i], ii[i], ii[i], ii[n+i], limbs + 1);
 #else
             mpn_add_n(ii[i], ii[i], ii[i], limbs + 1);