diff --git a/bin/sh/main.c b/bin/sh/main.c
--- a/bin/sh/main.c
+++ b/bin/sh/main.c
@@ -100,7 +100,7 @@
 int
 main(int argc, char *argv[])
 {
-	struct stackmark smark, smark2;
+	struct stackmark smark = {0}, smark2;
 	volatile int state;
 	char *shinit;