diff --git a/Parser/pgen.c b/Parser/pgen.c
index beaf53be0bd..b2f84709fc4 100644
--- a/Parser/pgen.c
+++ b/Parser/pgen.c
@@ -283,6 +283,7 @@ compile_atom(labellist *ll, nfa *nf, node *n, int *pa, int *pb)
 
     REQ(n, ATOM);
     i = n->n_nchildren;
+    (void)i; /* Don't warn about set but unused */
     REQN(i, 1);
     n = n->n_child;
     if (n->n_type == LPAR) {