diff --git a/wolfcrypt/src/tfm.c b/wolfcrypt/src/tfm.c
index b163a35ff..04e639ff3 100644
--- a/wolfcrypt/src/tfm.c
+++ b/wolfcrypt/src/tfm.c
@@ -1710,9 +1710,13 @@ static int _fp_exptmod_ct(fp_int * G, fp_int * X, int digits, fp_int * P,
 static int _fp_exptmod_nct(fp_int * G, fp_int * X, fp_int * P, fp_int * Y)
 {
   fp_int  *res;
-  fp_int  *M;
   fp_digit buf, mp;
   int      err, bitbuf, bitcpy, bitcnt, mode, digidx, x, y, winsize;
+#ifndef WOLFSSL_NO_MALLOC
+  fp_int  *M;
+#else
+  fp_int   M[(1 << 6) + 1];
+#endif
 
   /* find window size */
   x = fp_count_bits (X);
@@ -1733,12 +1737,14 @@ static int _fp_exptmod_nct(fp_int * G, fp_int * X, fp_int * P, fp_int * Y)
      return err;
   }
 
+#ifndef WOLFSSL_NO_MALLOC
   /* only allocate space for what's needed for window plus res */
   M = (fp_int*)XMALLOC(sizeof(fp_int)*((1 << winsize) + 1), NULL,
                                                            DYNAMIC_TYPE_BIGINT);
   if (M == NULL) {
      return FP_MEM;
   }
+#endif
   res = &M[(word32)(1 << winsize)];
 
   /* init M array */
@@ -1774,7 +1780,9 @@ static int _fp_exptmod_nct(fp_int * G, fp_int * X, fp_int * P, fp_int * Y)
     fp_sqr (&M[(word32)(1 << (winsize - 1))], &M[(word32)(1 << (winsize - 1))]);
     err = fp_montgomery_reduce (&M[(word32)(1 << (winsize - 1))], P, mp);
     if (err != FP_OKAY) {
+#ifndef WOLFSSL_NO_MALLOC
       XFREE(M, NULL, DYNAMIC_TYPE_BIGINT);
+#endif
       return err;
     }
   }
@@ -1783,12 +1791,16 @@ static int _fp_exptmod_nct(fp_int * G, fp_int * X, fp_int * P, fp_int * Y)
   for (x = (1 << (winsize - 1)) + 1; x < (1 << winsize); x++) {
     err = fp_mul(&M[x - 1], &M[1], &M[x]);
     if (err != FP_OKAY) {
+#ifndef WOLFSSL_NO_MALLOC
       XFREE(M, NULL, DYNAMIC_TYPE_BIGINT);
+#endif
       return err;
     }
     err = fp_montgomery_reduce(&M[x], P, mp);
     if (err != FP_OKAY) {
+#ifndef WOLFSSL_NO_MALLOC
       XFREE(M, NULL, DYNAMIC_TYPE_BIGINT);
+#endif
       return err;
     }
   }
@@ -1830,12 +1842,16 @@ static int _fp_exptmod_nct(fp_int * G, fp_int * X, fp_int * P, fp_int * Y)
     if (mode == 1 && y == 0) {
       err = fp_sqr(res, res);
       if (err != FP_OKAY) {
+#ifndef WOLFSSL_NO_MALLOC
         XFREE(M, NULL, DYNAMIC_TYPE_BIGINT);
+#endif
         return err;
       }
       fp_montgomery_reduce(res, P, mp);
       if (err != FP_OKAY) {
+#ifndef WOLFSSL_NO_MALLOC
         XFREE(M, NULL, DYNAMIC_TYPE_BIGINT);
+#endif
         return err;
       }
       continue;
@@ -1851,12 +1867,16 @@ static int _fp_exptmod_nct(fp_int * G, fp_int * X, fp_int * P, fp_int * Y)
       for (x = 0; x < winsize; x++) {
         err = fp_sqr(res, res);
         if (err != FP_OKAY) {
+#ifndef WOLFSSL_NO_MALLOC
           XFREE(M, NULL, DYNAMIC_TYPE_BIGINT);
+#endif
           return err;
         }
         err = fp_montgomery_reduce(res, P, mp);
         if (err != FP_OKAY) {
+#ifndef WOLFSSL_NO_MALLOC
           XFREE(M, NULL, DYNAMIC_TYPE_BIGINT);
+#endif
           return err;
         }
       }
@@ -1864,12 +1884,16 @@ static int _fp_exptmod_nct(fp_int * G, fp_int * X, fp_int * P, fp_int * Y)
       /* then multiply */
       err = fp_mul(res, &M[bitbuf], res);
       if (err != FP_OKAY) {
+#ifndef WOLFSSL_NO_MALLOC
         XFREE(M, NULL, DYNAMIC_TYPE_BIGINT);
+#endif
         return err;
       }
       err = fp_montgomery_reduce(res, P, mp);
       if (err != FP_OKAY) {
+#ifndef WOLFSSL_NO_MALLOC
         XFREE(M, NULL, DYNAMIC_TYPE_BIGINT);
+#endif
         return err;
       }
 
@@ -1886,12 +1910,16 @@ static int _fp_exptmod_nct(fp_int * G, fp_int * X, fp_int * P, fp_int * Y)
     for (x = 0; x < bitcpy; x++) {
       err = fp_sqr(res, res);
       if (err != FP_OKAY) {
+#ifndef WOLFSSL_NO_MALLOC
         XFREE(M, NULL, DYNAMIC_TYPE_BIGINT);
+#endif
         return err;
       }
       err = fp_montgomery_reduce(res, P, mp);
       if (err != FP_OKAY) {
+#ifndef WOLFSSL_NO_MALLOC
         XFREE(M, NULL, DYNAMIC_TYPE_BIGINT);
+#endif
         return err;
       }
 
@@ -1901,12 +1929,16 @@ static int _fp_exptmod_nct(fp_int * G, fp_int * X, fp_int * P, fp_int * Y)
         /* then multiply */
         err = fp_mul(res, &M[1], res);
         if (err != FP_OKAY) {
+#ifndef WOLFSSL_NO_MALLOC
           XFREE(M, NULL, DYNAMIC_TYPE_BIGINT);
+#endif
           return err;
         }
         err = fp_montgomery_reduce(res, P, mp);
         if (err != FP_OKAY) {
+#ifndef WOLFSSL_NO_MALLOC
           XFREE(M, NULL, DYNAMIC_TYPE_BIGINT);
+#endif
           return err;
         }
       }
@@ -1924,7 +1956,9 @@ static int _fp_exptmod_nct(fp_int * G, fp_int * X, fp_int * P, fp_int * Y)
   /* swap res with Y */
   fp_copy (res, Y);
 
+#ifndef WOLFSSL_NO_MALLOC
   XFREE(M, NULL, DYNAMIC_TYPE_BIGINT);
+#endif
   return err;
 }