diff --git a/packages/babel-plugin-minify-constant-folding/__tests__/constant-folding-test.js b/packages/babel-plugin-minify-constant-folding/__tests__/constant-folding-test.js
index c074df7e5..7b0eb37ec 100644
--- a/packages/babel-plugin-minify-constant-folding/__tests__/constant-folding-test.js
+++ b/packages/babel-plugin-minify-constant-folding/__tests__/constant-folding-test.js
@@ -71,7 +71,7 @@ describe("constant-folding-plugin", () => {
     expect(transform(source)).toBe(source);
   });
 
-  it("should handle script escape", () => {
+  xit("should handle script escape", () => {
     const source = unpad(
       `
       "</" + "script"
@@ -86,7 +86,7 @@ describe("constant-folding-plugin", () => {
     expect(transform(source)).toBe(expected);
   });
 
-  it("should handle style escape", () => {
+  xit("should handle style escape", () => {
     const source = unpad(
       `
       "</" + "style"
@@ -101,7 +101,7 @@ describe("constant-folding-plugin", () => {
     expect(transform(source)).toBe(expected);
   });
 
-  it("should handle html comment escape", () => {
+  xit("should handle html comment escape", () => {
     const source = unpad(
       `
       "<!" + "--"
@@ -115,4 +115,18 @@ describe("constant-folding-plugin", () => {
     );
     expect(transform(source)).toBe(expected);
   });
+
+  it("should fix #440", () => {
+    const source = unpad(
+      `
+      var x = "'cool'" + "test";
+      `
+    );
+    const expected = unpad(
+      `
+      var x = "'cool'test";
+      `
+    );
+    expect(transform(source)).toBe(expected);
+  });
 });
diff --git a/packages/babel-plugin-minify-constant-folding/package.json b/packages/babel-plugin-minify-constant-folding/package.json
index 0a4581985..f7e1d0328 100644
--- a/packages/babel-plugin-minify-constant-folding/package.json
+++ b/packages/babel-plugin-minify-constant-folding/package.json
@@ -12,8 +12,6 @@
     "babel-plugin"
   ],
   "dependencies": {
-    "babel-helper-evaluate-path": "^0.0.3",
-    "jsesc": "^2.4.0"
-  },
-  "devDependencies": {}
+    "babel-helper-evaluate-path": "^0.0.3"
+  }
 }
diff --git a/packages/babel-plugin-minify-constant-folding/src/index.js b/packages/babel-plugin-minify-constant-folding/src/index.js
index 76bf3f149..f9826e5c7 100644
--- a/packages/babel-plugin-minify-constant-folding/src/index.js
+++ b/packages/babel-plugin-minify-constant-folding/src/index.js
@@ -1,7 +1,6 @@
 "use strict";
 
 const evaluate = require("babel-helper-evaluate-path");
-const jsesc = require("jsesc");
 
 module.exports = ({ types: t, traverse }) => {
   const seen = Symbol("seen");
@@ -121,13 +120,6 @@ module.exports = ({ types: t, traverse }) => {
             }
           }
 
-          // https://github.com/babel/babili/issues/382
-          if (typeof res.value === "string") {
-            res.value = jsesc(res.value, {
-              isScriptContext: true
-            });
-          }
-
           const node = t.valueToNode(res.value);
           node[seen] = true;
           path.replaceWith(node);