diff --git a/library/x509_create.c b/library/x509_create.c
index d3d5851..4a15e7d 100644
--- a/library/x509_create.c
+++ b/library/x509_create.c
@@ -159,7 +159,7 @@
     ASN1_CHK_ADD( len, asn1_write_len( p, start, len ) );
     ASN1_CHK_ADD( len, asn1_write_tag( p, start, ASN1_CONSTRUCTED | ASN1_SET ) );
 
-    return( len );
+    return( (int) len );
 }
 
 int x509_write_names( unsigned char **p, unsigned char *start,
@@ -180,7 +180,7 @@
     ASN1_CHK_ADD( len, asn1_write_len( p, start, len ) );
     ASN1_CHK_ADD( len, asn1_write_tag( p, start, ASN1_CONSTRUCTED | ASN1_SEQUENCE ) );
 
-    return( len );
+    return( (int) len );
 }
 
 int x509_write_sig( unsigned char **p, unsigned char *start,
@@ -208,7 +208,7 @@
     ASN1_CHK_ADD( len, asn1_write_algorithm_identifier( p, start, oid,
                                                         oid_len, 0 ) );
 
-    return( len );
+    return( (int) len );
 }
 
 static int x509_write_extension( unsigned char **p, unsigned char *start,
@@ -235,7 +235,7 @@
     ASN1_CHK_ADD( len, asn1_write_len( p, start, len ) );
     ASN1_CHK_ADD( len, asn1_write_tag( p, start, ASN1_CONSTRUCTED | ASN1_SEQUENCE ) );
 
-    return( len );
+    return( (int) len );
 }
 
 /*
@@ -261,7 +261,7 @@
         cur_ext = cur_ext->next;
     }
 
-    return( len );
+    return( (int) len );
 }
 
 #endif /* POLARSSL_X509_CREATE_C */