diff --git a/CHANGELOG.md b/CHANGELOG.md
index f3172268..3867ee79 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -11,7 +11,9 @@
 
 ##### Bug Fixes
 
-* None.
+* Fix parse quoted values as strings.  
+  [Norio Nomura](https://github.com/norio-nomura)
+  [#105](https://github.com/jpsim/Yams/issues/116)
 
 ## 0.6.0
 
diff --git a/Sources/Yams/Parser.swift b/Sources/Yams/Parser.swift
index c006e007..a214d071 100644
--- a/Sources/Yams/Parser.swift
+++ b/Sources/Yams/Parser.swift
@@ -287,9 +287,8 @@ private class Event {
         return Node.Scalar.Style(rawValue: event.data.scalar.style.rawValue)!
     }
     var scalarTag: String? {
-        guard event.data.scalar.plain_implicit == 0,
-            event.data.scalar.quoted_implicit == 0 else {
-                return nil
+        if event.data.scalar.quoted_implicit == 1 {
+            return Tag.Name.str.rawValue
         }
         return string(from: event.data.scalar.tag)
     }
diff --git a/Tests/YamsTests/ConstructorTests.swift b/Tests/YamsTests/ConstructorTests.swift
index 143155f5..46193efa 100644
--- a/Tests/YamsTests/ConstructorTests.swift
+++ b/Tests/YamsTests/ConstructorTests.swift
@@ -287,6 +287,67 @@ class ConstructorTests: XCTestCase { // swiftlint:disable:this type_body_length
         YamsAssertEqual(objects, expected)
     }
 
+    func testQuotationMark() throws {
+        // swiftlint:disable line_length
+        // ```terminal.sh-session
+        // $ python
+        // Python 3.6.4 (default, Mar 16 2018, 17:10:15)
+        // [GCC 4.2.1 Compatible Apple LLVM 9.1.0 (clang-902.0.37.1)] on darwin
+        // Type "help", "copyright", "credits" or "license" for more information.
+        // >>> import yaml
+        // >>> yaml.load(r"""plain: 10.10
+        // ... single quote: '10.10'
+        // ... double quote: "10.10"
+        // ... literal: |
+        // ...     10.10
+        // ... literal single quote: |
+        // ...     '10.10'
+        // ... literal double quote: |
+        // ...     "10.10"
+        // ... folded: >
+        // ...     10.10
+        // ... folded single quote: >
+        // ...     '10.10'
+        // ... folded double quote: >
+        // ...     "10.10"
+        // ... """)
+        // {'plain': 10.1, 'single quote': '10.10', 'double quote': '10.10', 'literal': '10.10\n', 'literal single quote': "'10.10'\n", 'literal double quote': '"10.10"\n', 'folded': '10.10\n', 'folded single quote': "'10.10'\n", 'folded double quote': '"10.10"\n'}
+        // >>>
+        // ```
+        // swiftlint:enable line_length
+        let example = """
+            plain: 10.10
+            single quote: '10.10'
+            double quote: "10.10"
+            literal: |
+              10.10
+            literal single quote: |
+              '10.10'
+            literal double quote: |
+              "10.10"
+            folded: >
+              10.10
+            folded single quote: >
+              '10.10'
+            folded double quote: >
+              "10.10"
+
+            """
+        let objects = try Yams.load(yaml: example)
+        let expected: [String: Any] = [
+            "plain": 10.10,
+            "single quote": "10.10",
+            "double quote": "10.10",
+            "literal": "10.10\n",
+            "literal single quote": "'10.10'\n",
+            "literal double quote": "\"10.10\"\n",
+            "folded": "10.10\n",
+            "folded single quote": "'10.10'\n",
+            "folded double quote": "\"10.10\"\n"
+        ]
+        YamsAssertEqual(objects, expected)
+    }
+
     func testSet() throws {
         let example = """
             # Explicitly typed set.
@@ -429,6 +490,7 @@ extension ConstructorTests {
             ("testNull", testNull),
             ("testOmap", testOmap),
             ("testPairs", testPairs),
+            ("testQuotationMark", testQuotationMark),
             ("testSet", testSet),
             ("testSeq", testSeq),
             ("testTimestamp", testTimestamp),
diff --git a/Tests/YamsTests/YamlErrorTests.swift b/Tests/YamsTests/YamlErrorTests.swift
index 3c122c23..7c7c1d35 100644
--- a/Tests/YamsTests/YamlErrorTests.swift
+++ b/Tests/YamsTests/YamlErrorTests.swift
@@ -65,7 +65,7 @@ class YamlErrorTests: XCTestCase {
 
         let parser = try Parser(yaml: invalidYAML)
         // first iteration returns scalar
-        XCTAssertEqual(try parser.nextRoot(), Node("", Tag(.null), .literal))
+        XCTAssertEqual(try parser.nextRoot(), Node("", Tag(.str), .literal))
         // second iteration throws error
         XCTAssertThrowsError(try parser.nextRoot()) { error in
             XCTAssertTrue(error is YamlError)