diff --git a/wolfcrypt/src/asn.c b/wolfcrypt/src/asn.c
index 1ec02b6b5..351758559 100755
--- a/wolfcrypt/src/asn.c
+++ b/wolfcrypt/src/asn.c
@@ -4288,7 +4288,7 @@ static int GetName(DecodedCert* cert, int nameType)
             }
             if (copy && !tooBig) {
                 XMEMCPY(&full[idx], copy, XSTRLEN(copy));
-                idx += XSTRLEN(copy);
+                idx += (word32)XSTRLEN(copy);
                 XMEMCPY(&full[idx], &cert->source[cert->srcIdx], strLen);
                 idx += strLen;
             }