diff --git a/SConstruct b/SConstruct
index acdb808..705e853 100644
--- a/SConstruct
+++ b/SConstruct
@@ -30,6 +30,7 @@ env = Environment(
     "-g",
     "-fPIC",
     "-O2",
+    "-Wunused",
     "-Werror",
   ] + ccflags_asan,
   LDFLAGS=ldflags_asan,