diff --git a/spectre_v2.c b/spectre_v2.c
index ee223fc..e16d9cf 100644
--- a/spectre_v2.c
+++ b/spectre_v2.c
@@ -38,7 +38,7 @@ gadget(char* addr)
 
 // safe target of indirect call
 int
-safe_target()
+safe_target(char* addr)
 {
 	return 42;
 }