diff --git a/sys/ddb/db_command.c b/sys/ddb/db_command.c
index dfcc9c35af61..b97c05a769f6 100644
--- a/sys/ddb/db_command.c
+++ b/sys/ddb/db_command.c
@@ -472,7 +472,7 @@ db_error(s)
 	char *s;
 {
 	if (s)
-	    db_printf(s);
+	    db_printf("%s", s);
 	db_flush_lex();
 	longjmp(db_jmpbuf, 1);
 }