diff --git a/apps/opt.c b/apps/opt.c
index f4eba2dca0ddf4de91ee0005d84db230b16a1497..af994bb74318ee98f95bd3bc638f70226842b6b2 100644
--- a/apps/opt.c
+++ b/apps/opt.c
@@ -163,8 +163,8 @@ char *opt_init(int ac, char **av, const OPTIONS *o)
     unknown = NULL;
 
     for (; o->name; ++o) {
-        const OPTIONS *next;
 #ifndef NDEBUG
+        const OPTIONS *next;
         int duplicated, i;
 #endif