diff --git a/Jakefile.js b/Jakefile.js
index 55729eecaad..2ad7ef376c3 100644
--- a/Jakefile.js
+++ b/Jakefile.js
@@ -251,7 +251,7 @@ function compileFile(outFile, sources, prereqs, prefixes, useBuiltCompiler, opts
         else {
             options += " --lib es5";
         }
-        options += " --noUnusedLocals --noUnusedParameters --strictNullChecks";
+        options += " --noUnusedLocals --noUnusedParameters --strictNullChecks --strictAny";
 
         var cmd = host + " " + compilerPath + " " + options + " ";
         cmd = cmd + sources.join(" ");
diff --git a/src/tsconfig-base.json b/src/tsconfig-base.json
index 92c32e73fcc..98248235b0e 100644
--- a/src/tsconfig-base.json
+++ b/src/tsconfig-base.json
@@ -3,6 +3,7 @@
         "lib": ["es5"],
         "noEmitOnError": true,
         "strictNullChecks": true,
+        "strictAny": true,
         "noImplicitAny": true,
         "noImplicitThis": true,
         "noUnusedLocals": true,