diff --git a/library/bignum.c b/library/bignum.c
index 1a762a2..9776d29 100644
--- a/library/bignum.c
+++ b/library/bignum.c
@@ -660,7 +660,7 @@
                                 const unsigned char *buf, size_t buflen )
 {
     int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
-    size_t const limbs = CHARS_TO_LIMBS( buflen );
+    const size_t limbs = CHARS_TO_LIMBS( buflen );
 
     /* Ensure that target MPI has exactly the necessary number of limbs */
     MBEDTLS_MPI_CHK( mbedtls_mpi_resize_clear( X, limbs ) );
@@ -686,7 +686,7 @@
 int mbedtls_mpi_read_binary( mbedtls_mpi *X, const unsigned char *buf, size_t buflen )
 {
     int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
-    size_t const limbs = CHARS_TO_LIMBS( buflen );
+    const size_t limbs = CHARS_TO_LIMBS( buflen );
 
     MPI_VALIDATE_RET( X != NULL );
     MPI_VALIDATE_RET( buflen == 0 || buf != NULL );
@@ -2139,7 +2139,7 @@
                      void *p_rng )
 {
     int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
-    size_t const limbs = CHARS_TO_LIMBS( size );
+    const size_t limbs = CHARS_TO_LIMBS( size );
 
     MPI_VALIDATE_RET( X     != NULL );
     MPI_VALIDATE_RET( f_rng != NULL );