diff --git a/src/__fixtures__/unified b/src/__fixtures__/unified
new file mode 100644
index 0000000..9c7e37f
--- /dev/null
+++ b/src/__fixtures__/unified
@@ -0,0 +1,6 @@
+diff --git a/test.txt b/test.txt
+index 27b30e2..62944e1 100644
+--- a/test.txt
++++ b/test.txt
+@@ -2,0 +3 @@ bbb
++ddd
\ No newline at end of file
diff --git a/src/__tests__/__snapshots__/chunk-context.test.ts.snap b/src/__tests__/__snapshots__/chunk-context.test.ts.snap
index f2fa843..85ef29e 100644
--- a/src/__tests__/__snapshots__/chunk-context.test.ts.snap
+++ b/src/__tests__/__snapshots__/chunk-context.test.ts.snap
@@ -14,14 +14,14 @@ exports[`chunk-context parse \`chunk-context\` 1`] = `
               "type": "UnchangedLine",
             },
             {
-              "content": "  console.log(\"hello world\");",
+              "content": "  console.log("hello world");",
               "lineAfter": 5,
               "type": "AddedLine",
             },
           ],
           "context": "function hello() {",
           "fromFileRange": {
-            "lines": 4,
+            "lines": 1,
             "start": 4,
           },
           "toFileRange": {
diff --git a/src/__tests__/__snapshots__/unified.test.ts.snap b/src/__tests__/__snapshots__/unified.test.ts.snap
new file mode 100644
index 0000000..ffe28b1
--- /dev/null
+++ b/src/__tests__/__snapshots__/unified.test.ts.snap
@@ -0,0 +1,34 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`unified parse \`unified 1`] = `
+{
+  "files": [
+    {
+      "chunks": [
+        {
+          "changes": [
+            {
+              "content": "ddd",
+              "lineAfter": 3,
+              "type": "AddedLine",
+            },
+          ],
+          "context": "bbb",
+          "fromFileRange": {
+            "lines": 0,
+            "start": 2,
+          },
+          "toFileRange": {
+            "lines": 1,
+            "start": 3,
+          },
+          "type": "Chunk",
+        },
+      ],
+      "path": "test.txt",
+      "type": "ChangedFile",
+    },
+  ],
+  "type": "GitDiff",
+}
+`;
diff --git a/src/__tests__/unified.test.ts b/src/__tests__/unified.test.ts
new file mode 100644
index 0000000..87e5c54
--- /dev/null
+++ b/src/__tests__/unified.test.ts
@@ -0,0 +1,10 @@
+import { getFixture } from './test-utils';
+import parseGitDiff from '../parse-git-diff';
+
+describe('unified', () => {
+  const fixture = getFixture('unified');
+
+  it('parse `unified', () => {
+    expect(parseGitDiff(fixture)).toMatchSnapshot();
+  });
+});
diff --git a/src/parse-git-diff.ts b/src/parse-git-diff.ts
index 4c74fce..1075956 100644
--- a/src/parse-git-diff.ts
+++ b/src/parse-git-diff.ts
@@ -280,7 +280,7 @@ function getRange(start: string, lines?: string) {
   const startNum = parseInt(start, 10);
   return {
     start: startNum,
-    lines: lines === undefined ? startNum : parseInt(lines, 10),
+    lines: lines === undefined ? 1 : parseInt(lines, 10),
   };
 }