diff --git a/packages/core/package.json b/packages/core/package.json
index f8a2daa1..903fb075 100644
--- a/packages/core/package.json
+++ b/packages/core/package.json
@@ -14,7 +14,7 @@
     "test": "jest",
     "lint": "eslint .",
     "format": "eslint . --fix",
-    "build": "babel --no-babelrc --plugins=transform-es2015-modules-commonjs,transform-react-jsx,transform-class-properties,transform-object-rest-spread,transform-flow-strip-types src --copy-files --out-dir dist --ignore '**/__tests__/**'",
+    "build": "babel --no-babelrc --plugins=transform-es2015-block-scoping,transform-es2015-modules-commonjs,transform-react-jsx,transform-class-properties,transform-object-rest-spread,transform-flow-strip-types src --copy-files --out-dir dist --ignore '**/__tests__/**'",
     "prepare": "yarn build",
     "release": "release-it"
   },
@@ -49,6 +49,7 @@
     "babel-cli": "^6.26.0",
     "babel-jest": "^22.4.1",
     "babel-plugin-transform-class-properties": "^6.13.0",
+    "babel-plugin-transform-es2015-block-scoping": "^6.26.0",
     "babel-plugin-transform-es2015-modules-commonjs": "^6.26.2",
     "babel-plugin-transform-flow-strip-types": "^6.22.0",
     "babel-plugin-transform-object-rest-spread": "^6.13.0",
diff --git a/packages/core/yarn.lock b/packages/core/yarn.lock
index 3a74a944..ce32e56f 100644
--- a/packages/core/yarn.lock
+++ b/packages/core/yarn.lock
@@ -1348,7 +1348,7 @@ babel-plugin-transform-es2015-block-scoped-functions@^6.22.0, babel-plugin-trans
   dependencies:
     babel-runtime "^6.22.0"
 
-babel-plugin-transform-es2015-block-scoping@^6.23.0, babel-plugin-transform-es2015-block-scoping@^6.5.0, babel-plugin-transform-es2015-block-scoping@^6.8.0:
+babel-plugin-transform-es2015-block-scoping@^6.23.0, babel-plugin-transform-es2015-block-scoping@^6.26.0, babel-plugin-transform-es2015-block-scoping@^6.5.0, babel-plugin-transform-es2015-block-scoping@^6.8.0:
   version "6.26.0"
   resolved "https://registry.yarnpkg.com/babel-plugin-transform-es2015-block-scoping/-/babel-plugin-transform-es2015-block-scoping-6.26.0.tgz#d70f5299c1308d05c12f463813b0a09e73b1895f"
   integrity sha1-1w9SmcEwjQXBL0Y4E7CgnnOxiV8=