diff --git a/library/asn1parse.c b/library/asn1parse.c
index e59d250..ffa2f52 100644
--- a/library/asn1parse.c
+++ b/library/asn1parse.c
@@ -269,7 +269,8 @@
         /* Allocate and assign next pointer */
         if( *p < end )
         {
-            cur->next = mbedtls_calloc( 1, sizeof( mbedtls_asn1_sequence ) );
+            cur->next = (mbedtls_asn1_sequence*)mbedtls_calloc( 1,
+                                            sizeof( mbedtls_asn1_sequence ) );
 
             if( cur->next == NULL )
                 return( MBEDTLS_ERR_ASN1_ALLOC_FAILED );