diff --git a/library/bignum.c b/library/bignum.c
index b65858d..f94bf57 100644
--- a/library/bignum.c
+++ b/library/bignum.c
@@ -105,12 +105,12 @@
     mbedtls_mpi_uint *p;
 
     if( nblimbs > MBEDTLS_MPI_MAX_LIMBS )
-        return( MBEDTLS_ERR_MPI_MALLOC_FAILED );
+        return( MBEDTLS_ERR_MPI_ALLOC_FAILED );
 
     if( X->n < nblimbs )
     {
         if( ( p = mbedtls_calloc( nblimbs, ciL ) ) == NULL )
-            return( MBEDTLS_ERR_MPI_MALLOC_FAILED );
+            return( MBEDTLS_ERR_MPI_ALLOC_FAILED );
 
         if( X->p != NULL )
         {
@@ -148,7 +148,7 @@
         i = nblimbs;
 
     if( ( p = mbedtls_calloc( i, ciL ) ) == NULL )
-        return( MBEDTLS_ERR_MPI_MALLOC_FAILED );
+        return( MBEDTLS_ERR_MPI_ALLOC_FAILED );
 
     if( X->p != NULL )
     {