diff --git a/hping2.h b/hping2.h
index 70e2035..3766e1d 100644
--- a/hping2.h
+++ b/hping2.h
@@ -353,7 +353,7 @@ struct delaytable_element {
int status;
};
-volatile struct delaytable_element delaytable[TABLESIZE];
+extern volatile struct delaytable_element delaytable[TABLESIZE];
/* protos */
void nop(void); /* nop */