diff --git a/src/clean-ast.js b/src/clean-ast.js
index 4e6901adb..17aaa7d3c 100644
--- a/src/clean-ast.js
+++ b/src/clean-ast.js
@@ -83,14 +83,20 @@ function massageAST(ast) {
     }
 
     if (
-      (ast.type === "media-value" ||
+      (ast.type === "media-feature" ||
+        ast.type === "media-type" ||
+        ast.type === "media-unknown" ||
+        ast.type === "media-value" ||
         ast.type === "selector-attribute" ||
+        ast.type === "selector-string" ||
         ast.type === "value-string") &&
       newObj.value
     ) {
-      newObj.value = newObj.value
-        .replace(/'/g, '"')
-        .replace(/\\([^a-fA-F\d])/g, "$1");
+      newObj.value = cleanCSSStrings(newObj.value);
+    }
+
+    if (ast.type === "css-import" && newObj.importPath) {
+      newObj.importPath = cleanCSSStrings(newObj.importPath);
     }
 
     // (TypeScript) Ignore `static` in `constructor(static p) {}`
@@ -185,4 +191,8 @@ function massageAST(ast) {
   return ast;
 }
 
+function cleanCSSStrings(value) {
+  return value.replace(/'/g, '"').replace(/\\([^a-fA-F\d])/g, "$1");
+}
+
 module.exports = { cleanAST, massageAST };
diff --git a/src/printer-postcss.js b/src/printer-postcss.js
index cb7c7c036..ba093eefc 100644
--- a/src/printer-postcss.js
+++ b/src/printer-postcss.js
@@ -128,7 +128,7 @@ function genericPrint(path, options, print) {
         n.name,
         " ",
         n.directives ? concat([n.directives, " "]) : "",
-        n.importPath,
+        adjustStrings(n.importPath, options),
         ";"
       ]);
     }
@@ -148,7 +148,14 @@ function genericPrint(path, options, print) {
       return join(" ", path.map(print, "nodes"));
     }
     case "media-type": {
-      return n.value;
+      const parent = path.getParentNode(2);
+      if (
+        parent.type === "css-atrule" &&
+        parent.name.toLowerCase() === "charset"
+      ) {
+        return n.value;
+      }
+      return adjustStrings(n.value, options);
     }
     case "media-feature-expression": {
       if (!n.nodes) {
@@ -157,7 +164,7 @@ function genericPrint(path, options, print) {
       return concat(["(", concat(path.map(print, "nodes")), ")"]);
     }
     case "media-feature": {
-      return n.value.replace(/ +/g, " ");
+      return adjustStrings(n.value.replace(/ +/g, " "), options);
     }
     case "media-colon": {
       return concat([n.value, " "]);
@@ -172,7 +179,7 @@ function genericPrint(path, options, print) {
       return n.value;
     }
     case "media-unknown": {
-      return n.value;
+      return adjustStrings(n.value, options);
     }
     // postcss-selector-parser
     case "selector-root": {
@@ -182,7 +189,7 @@ function genericPrint(path, options, print) {
       return n.value;
     }
     case "selector-string": {
-      return n.value;
+      return adjustStrings(n.value, options);
     }
     case "selector-tag": {
       return n.value;
diff --git a/tests/css_quotes/__snapshots__/jsfmt.spec.js.snap b/tests/css_quotes/__snapshots__/jsfmt.spec.js.snap
index e5ce5163a..55f554466 100644
--- a/tests/css_quotes/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/css_quotes/__snapshots__/jsfmt.spec.js.snap
@@ -1,6 +1,12 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
 exports[`quotes.css 1`] = `
+@charset "UTF-8";
+/* @charset must always have double quotes: https://www.w3.org/TR/css-syntax-3/#determine-the-fallback-encoding */
+/* Also, it has to be the very first thing in the file, but here are some more tests anyway: */
+@CHARSET "UTF-8"; /* Case insensitive for "consistency". */
+@charset 'UTF-8'; /* Single quotes are invalid here. Keep them since we don't know what the user is doing. */
+
 @supports (content: one "two" three 'four') {
   a[href="foo" y],
   abbr[title^='It\\'s a trap!'],
@@ -68,7 +74,25 @@ exports[`quotes.css 1`] = `
     content: '\\Abc4 foo \\n' /* 'comment' */ '\\end';
   }
 }
+
+@import "file.css";
+
+@foo "one";
+@foo 'one';
+@foo "one" two 'three';
+@foo ("one");
+@foo ('one');
+@foo ("one" two 'three');
+
+one "two" three {}
+one 'two' three {}
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+@charset "UTF-8";
+/* @charset must always have double quotes: https://www.w3.org/TR/css-syntax-3/#determine-the-fallback-encoding */
+/* Also, it has to be the very first thing in the file, but here are some more tests anyway: */
+@CHARSET "UTF-8"; /* Case insensitive for "consistency". */
+@charset 'UTF-8'; /* Single quotes are invalid here. Keep them since we don't know what the user is doing. */
+
 @supports (content: one "two" three "four") {
   a[href="foo" y],
   abbr[title^="It's a trap!"],
@@ -137,9 +161,29 @@ exports[`quotes.css 1`] = `
   }
 }
 
+@import "file.css";
+
+@foo "one";
+@foo "one";
+@foo "one" two "three";
+@foo ("one");
+@foo ("one");
+@foo ("one" two "three");
+
+one "two" three {
+}
+one "two" three {
+}
+
 `;
 
 exports[`quotes.css 2`] = `
+@charset "UTF-8";
+/* @charset must always have double quotes: https://www.w3.org/TR/css-syntax-3/#determine-the-fallback-encoding */
+/* Also, it has to be the very first thing in the file, but here are some more tests anyway: */
+@CHARSET "UTF-8"; /* Case insensitive for "consistency". */
+@charset 'UTF-8'; /* Single quotes are invalid here. Keep them since we don't know what the user is doing. */
+
 @supports (content: one "two" three 'four') {
   a[href="foo" y],
   abbr[title^='It\\'s a trap!'],
@@ -207,7 +251,25 @@ exports[`quotes.css 2`] = `
     content: '\\Abc4 foo \\n' /* 'comment' */ '\\end';
   }
 }
+
+@import "file.css";
+
+@foo "one";
+@foo 'one';
+@foo "one" two 'three';
+@foo ("one");
+@foo ('one');
+@foo ("one" two 'three');
+
+one "two" three {}
+one 'two' three {}
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+@charset "UTF-8";
+/* @charset must always have double quotes: https://www.w3.org/TR/css-syntax-3/#determine-the-fallback-encoding */
+/* Also, it has to be the very first thing in the file, but here are some more tests anyway: */
+@CHARSET "UTF-8"; /* Case insensitive for "consistency". */
+@charset 'UTF-8'; /* Single quotes are invalid here. Keep them since we don't know what the user is doing. */
+
 @supports (content: one 'two' three 'four') {
   a[href='foo' y],
   abbr[title^="It's a trap!"],
@@ -276,4 +338,18 @@ exports[`quotes.css 2`] = `
   }
 }
 
+@import 'file.css';
+
+@foo 'one';
+@foo 'one';
+@foo 'one' two 'three';
+@foo ('one');
+@foo ('one');
+@foo ('one' two 'three');
+
+one 'two' three {
+}
+one 'two' three {
+}
+
 `;
diff --git a/tests/css_quotes/quotes.css b/tests/css_quotes/quotes.css
index 6bd51a39f..bef61658c 100644
--- a/tests/css_quotes/quotes.css
+++ b/tests/css_quotes/quotes.css
@@ -1,3 +1,9 @@
+@charset "UTF-8";
+/* @charset must always have double quotes: https://www.w3.org/TR/css-syntax-3/#determine-the-fallback-encoding */
+/* Also, it has to be the very first thing in the file, but here are some more tests anyway: */
+@CHARSET "UTF-8"; /* Case insensitive for "consistency". */
+@charset 'UTF-8'; /* Single quotes are invalid here. Keep them since we don't know what the user is doing. */
+
 @supports (content: one "two" three 'four') {
   a[href="foo" y],
   abbr[title^='It\'s a trap!'],
@@ -65,3 +71,15 @@
     content: '\Abc4 foo \n' /* 'comment' */ '\end';
   }
 }
+
+@import "file.css";
+
+@foo "one";
+@foo 'one';
+@foo "one" two 'three';
+@foo ("one");
+@foo ('one');
+@foo ("one" two 'three');
+
+one "two" three {}
+one 'two' three {}