diff --git a/lisc/isel.c b/lisc/isel.c
index 0e9689b..6c579d6 100644
--- a/lisc/isel.c
+++ b/lisc/isel.c
@@ -668,6 +668,7 @@ selpar(Fn *fn, Ins *i0, Ins *i1)
 
 	curi = insb;
 	ni = 0;
+	ns = 0;
 	assert(NAlign == 3);
 	stk = -2;
 	for (i=i0, a=ac; i<i1; i++, a++) {