diff --git a/apps/ca.c b/apps/ca.c
index 89f0de35683008c83463753b3ba70e4161b8ad67..baa6a906a55173bd5ede4b7b964aee1e3bcf6eb3 100644
--- a/apps/ca.c
+++ b/apps/ca.c
@@ -709,7 +709,7 @@ bad:
 		ERR_clear_error();
 #ifdef RL_DEBUG
 	if (!p)
-		BIO_printf(bio_err, "DEBUG: unique_subject undefined\n", p);
+		BIO_printf(bio_err, "DEBUG: unique_subject undefined\n");
 #endif
 #ifdef RL_DEBUG
 	BIO_printf(bio_err, "DEBUG: configured unique_subject is %d\n",