diff --git a/jsrun.c b/jsrun.c
index 113db4a..5e70684 100644
--- a/jsrun.c
+++ b/jsrun.c
@@ -444,6 +444,11 @@ void js_rot(js_State *J, int n)
 int js_isarrayindex(js_State *J, const char *p, int *idx)
 {
 	int n = 0;
+
+	/* check for '0' and integers with leading zero */
+	if (p[0] == '0')
+		return (p[1] == 0) ? *idx = 0, 1 : 0;
+
 	while (*p) {
 		int c = *p++;
 		if (c >= '0' && c <= '9') {