diff --git a/SConstruct b/SConstruct
index 4472fd3012..520716859a 100644
--- a/SConstruct
+++ b/SConstruct
@@ -165,6 +165,7 @@ env = Environment(
     "-g",
     "-fPIC",
     "-O2",
+    "-Wunused",
     "-Werror",
     "-Wshadow",
     "-Wno-unknown-warning-option",