diff --git a/library/ssl_tls.c b/library/ssl_tls.c
index 020d0e8..c01ee36 100644
--- a/library/ssl_tls.c
+++ b/library/ssl_tls.c
@@ -3547,6 +3547,8 @@
 
     memcpy( ssl->psk, psk, ssl->psk_len );
     memcpy( ssl->psk_identity, psk_identity, ssl->psk_identity_len );
+
+    return( 0 );
 }
 
 void ssl_set_psk_cb( ssl_context *ssl,