diff --git a/configure.ac b/configure.ac
index bc0af28bbf..50ce2d955a 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1196,6 +1196,8 @@ then
     test "$enable_session_ticket" = "" && enable_session_ticket=yes
     test "$enable_earlydata" = "" && enable_earlydata=yes
     test "$enable_rpk" = "" && enable_rpk=yes
+    # writedup and secure renegotiation cannot both be on
+    test "$enable_writedup" = "" && test "$enable_secure_renegotiation" != "yes" && enable_writedup=yes
 
     if test "$KERNEL_MODE_DEFAULTS" != "yes"
     then
diff --git a/src/ssl.c b/src/ssl.c
index 9972e9f7cd..1690e0b159 100644
--- a/src/ssl.c
+++ b/src/ssl.c
@@ -875,6 +875,7 @@ WOLFSSL* wolfSSL_write_dup(WOLFSSL* ssl)
     }
 
     WOLFSSL_LEAVE("wolfSSL_write_dup", ret);
+    (void)ret; /* ret is used for debug message, dup is set to null on fail */
 
     return dup;
 }