diff --git a/sys/opencrypto/crypto.c b/sys/opencrypto/crypto.c
index 0e3ae6965ca5..79abc050764f 100644
--- a/sys/opencrypto/crypto.c
+++ b/sys/opencrypto/crypto.c
@@ -525,7 +525,7 @@ crypto_newsession(u_int64_t *sid, struct cryptoini *cri, int crid)
 			(*sid) |= (lid & 0xffffffff);
 			cap->cc_sessions++;
 		} else
-			CRYPTDEB("dev newsession failed");
+			CRYPTDEB("dev newsession failed: %d", err);
 	} else {
 		CRYPTDEB("no driver");
 		err = EOPNOTSUPP;
diff --git a/sys/opencrypto/cryptodev.h b/sys/opencrypto/cryptodev.h
index ea5173af62ac..eea1a00c50b8 100644
--- a/sys/opencrypto/cryptodev.h
+++ b/sys/opencrypto/cryptodev.h
@@ -348,10 +348,11 @@ struct cryptostats {
 #ifdef _KERNEL
 
 #if 0
-#define CRYPTDEB(s)	do { printf("%s:%d: %s\n", __FILE__, __LINE__, s); \
-			} while (0)
+#define CRYPTDEB(s, ...) do {						\
+	printf("%s:%d: " s "\n", __FILE__, __LINE__, ## __VA_ARGS__);	\
+} while (0)
 #else
-#define CRYPTDEB(s)	do { } while (0)
+#define CRYPTDEB(...)	do { } while (0)
 #endif
 
 /* Standard initialization structure beginning */