diff --git a/library/ssl_tls.c b/library/ssl_tls.c
index 23689d995..8b774dfaa 100644
--- a/library/ssl_tls.c
+++ b/library/ssl_tls.c
@@ -6869,7 +6869,7 @@ static int ssl_write_real( mbedtls_ssl_context *ssl,
  *
  * With non-blocking I/O, ssl_write_real() may return WANT_WRITE,
  * then the caller will call us again with the same arguments, so
- * remember wether we already did the split or not.
+ * remember whether we already did the split or not.
  */
 #if defined(MBEDTLS_SSL_CBC_RECORD_SPLITTING)
 static int ssl_write_split( mbedtls_ssl_context *ssl,