diff --git a/components/mbedtls/port/esp_bignum.c b/components/mbedtls/port/esp_bignum.c
index b261cbf494..e7a9f5461f 100644
--- a/components/mbedtls/port/esp_bignum.c
+++ b/components/mbedtls/port/esp_bignum.c
@@ -513,6 +513,8 @@ int mbedtls_mpi_mul_mpi( mbedtls_mpi *Z, const mbedtls_mpi *X, const mbedtls_mpi
     /* Result Z has to have room for double the larger factor */
     words_z = words_mult * 2;
 
+    /* Grow Z to result size early, avoid interim allocations */
+    mbedtls_mpi_grow(Z, words_z);
 
     /* If either factor is over 2048 bits, we can't use the standard hardware multiplier
        (it assumes result is double longest factor, and result is max 4096 bits.)
@@ -665,9 +667,6 @@ static int mpi_mult_mpi_overlong(mbedtls_mpi *Z, const mbedtls_mpi *X, const mbe
     };
     mbedtls_mpi_init(&Ztemp);
 
-    /* Grow Z to result size early, avoid interim allocations */
-    mbedtls_mpi_grow(Z, words_result);
-
     /* Get result Ztemp = Yp * X (need temporary variable Ztemp) */
     MBEDTLS_MPI_CHK( mbedtls_mpi_mul_mpi(&Ztemp, X, &Yp) );