diff --git a/library/ssl_cli.c b/library/ssl_cli.c
index 3a0e6df..0e25b6c 100644
--- a/library/ssl_cli.c
+++ b/library/ssl_cli.c
@@ -762,7 +762,7 @@
     *p++ = MBEDTLS_BYTE_0( MBEDTLS_TLS_EXT_USE_SRTP );
 
 
-    *p++ = MBEDTLS_BYTE_1( ext_len & 0xFF00 );
+    *p++ = MBEDTLS_BYTE_1( ext_len );
     *p++ = MBEDTLS_BYTE_0( ext_len );
 
     /* protection profile length: 2*(ssl->conf->dtls_srtp_profile_list_len) */