diff --git a/src/__tests__/__snapshots__/interpreter.test.js.snap b/src/__tests__/__snapshots__/interpreter.test.js.snap
index 1858c5c0..64ae381b 100644
--- a/src/__tests__/__snapshots__/interpreter.test.js.snap
+++ b/src/__tests__/__snapshots__/interpreter.test.js.snap
@@ -170,6 +170,8 @@ exports[`interpreter correct target code {"foo": 3} | {"bar": "baz", ...$} 1`] =
 
 exports[`interpreter correct target code {"original": $.foo} | {"new": $} 1`] = `"(function(_) { return (function(input) { return (function (input) {return (_.objectify(Array.from([[\\"new\\",input]])))})((_.objectify(Array.from([[\\"original\\",input.foo]]))))})})"`;
 
+exports[`interpreter correct target code {'foo': ('bar' | 'baz')} 1`] = `"(function(_) { return (function(input) { return (_.objectify(Array.from([['foo',((function (input) {return 'baz'})('bar'))]])))})})"`;
+
 exports[`interpreter correct target code {each $: (length) in $} 1`] = `"(function(_) { return (function(input) { return (_.objectify(Array.from(((function (input) {return _.map((function(input) {return [input,(_.length(input))]}))(input)})(input)))))})})"`;
 
 exports[`interpreter correct target code -(3 * 2) -1 > -1.34 * 3 && true 1`] = `"(function(_) { return (function(input) { return (-((3*2)))-1>(-(1.34))*3&&true})})"`;
@@ -5204,6 +5206,67 @@ Object {
 }
 `;
 
+exports[`interpreter correct target tree {'foo': ('bar' | 'baz')} 1`] = `
+Object {
+  "status": true,
+  "value": Object {
+    "end": Object {
+      "column": 25,
+      "line": 1,
+      "offset": 24,
+    },
+    "name": "object",
+    "start": Object {
+      "column": 1,
+      "line": 1,
+      "offset": 0,
+    },
+    "value": Array [
+      Object {
+        "end": Object {
+          "column": 24,
+          "line": 1,
+          "offset": 23,
+        },
+        "name": "simpleList",
+        "start": Object {
+          "column": 2,
+          "line": 1,
+          "offset": 1,
+        },
+        "value": Array [
+          Object {
+            "name": "tuple",
+            "value": Array [
+              Object {
+                "name": "primitive",
+                "value": "'foo'",
+              },
+              Object {
+                "name": "parentheses",
+                "value": Object {
+                  "name": "pipe",
+                  "value": Object {
+                    "left": Object {
+                      "name": "primitive",
+                      "value": "'bar'",
+                    },
+                    "right": Object {
+                      "name": "primitive",
+                      "value": "'baz'",
+                    },
+                  },
+                },
+              },
+            ],
+          },
+        ],
+      },
+    ],
+  },
+}
+`;
+
 exports[`interpreter correct target tree {each $: (length) in $} 1`] = `
 Object {
   "status": true,
diff --git a/src/__tests__/interpreter.test.js b/src/__tests__/interpreter.test.js
index 4f645f77..f5cd9f49 100644
--- a/src/__tests__/interpreter.test.js
+++ b/src/__tests__/interpreter.test.js
@@ -106,6 +106,12 @@ const tests = [
       foo: 'baz'
     }
   },
+  {
+    sourceCode: `{'foo': ('bar' | 'baz')}`,
+    output: {
+      foo: 'baz'
+    }
+  },
   {
     sourceCode: `{"foo": ("bar" | "baz")}["foo"]`,
     output: 'baz'
diff --git a/src/parsers/__tests__/primitives.test.js b/src/parsers/__tests__/primitives.test.js
index 536fe425..d7a88966 100644
--- a/src/parsers/__tests__/primitives.test.js
+++ b/src/parsers/__tests__/primitives.test.js
@@ -17,7 +17,7 @@ const testExample = (parser: ParserType): (SourceCodeType => void) => (
   })
 }
 
-const stringExamples = [`""`, `"foo"`, `"Fo bar ²¡ü"`]
+const stringExamples = [`""`, `"foo"`, `"Fo ba'r' ²¡ü"`, `'asd "go" asd'`]
 const numberExamples = ['3.14', '42', '0', '111.111', '0.33']
 const examples = [...stringExamples, ...numberExamples]
 
diff --git a/src/parsers/primitive.js b/src/parsers/primitive.js
index 8910859b..2e77b85e 100644
--- a/src/parsers/primitive.js
+++ b/src/parsers/primitive.js
@@ -6,7 +6,9 @@ import P from 'parsimmon'
 import type { NodeType } from '../types'
 
 const keywords = ['null', 'true', 'false']
-export const StringParserRegExp = /("(((?=\\)\\(["\\\/bfnrt]|u[0-9a-fA-F]{4}))|[^"\\\0-\x1F\x7F]+)*")/
+const DoubleQuoteStringRegexp = /("(((?=\\)\\(["\\\/bfnrt]|u[0-9a-fA-F]{4}))|[^"\\\0-\x1F\x7F]+)*")/
+const SingleQuoteStringRegexp = /('(((?=\\)\\(['\\\/bfnrt]|u[0-9a-fA-F]{4}))|[^'\\\0-\x1F\x7F]+)*')/
+export const StringParserRegExp = new RegExp(`(${DoubleQuoteStringRegexp.source}|${SingleQuoteStringRegexp.source})`)
 const NumberParserRegExp = /(?:0|[1-9]\d*)(?:\.\d+)?(?:[eE][+-]?\d+)?/
 
 const options = [