diff --git a/build/tslint.json b/build/tslint.json
index 83af391a1..4bde4cf07 100644
--- a/build/tslint.json
+++ b/build/tslint.json
@@ -15,14 +15,14 @@
         "variable-name": [false, "allow-leading-underscore"],
         "no-empty": true,
         "no-eval": true,
-		"no-unused-variable": [false],
+		"no-unused-variable": [true],
 		"no-duplicate-variable": true,
 
         "no-bitwise": false,
         "no-string-literal": false,
         "no-trailing-whitespace": false,
         "no-unreachable": false,
-        "no-unused-expression": false,
+        "no-unused-expression": true,
         "no-use-before-declare": false,
         "no-var-requires": false,
         "one-line": [false,