diff --git a/library/ssl_srv.c b/library/ssl_srv.c
index cb8d140..a8b9022 100644
--- a/library/ssl_srv.c
+++ b/library/ssl_srv.c
@@ -726,7 +726,8 @@
         }
 
         ret = rsa_pkcs1_decrypt( ssl->rsa_key, RSA_PRIVATE, &ssl->pmslen,
-                                 ssl->in_msg + i, ssl->premaster );
+                                 ssl->in_msg + i, ssl->premaster,
+				 sizeof(ssl->premaster) );
 
         if( ret != 0 || ssl->pmslen != 48 ||
             ssl->premaster[0] != ssl->max_major_ver ||