diff --git a/packages/pug-lexer/test/__snapshots__/index.test.js.snap b/packages/pug-lexer/test/__snapshots__/index.test.js.snap
index 962d17d9a..0057877bb 100644
--- a/packages/pug-lexer/test/__snapshots__/index.test.js.snap
+++ b/packages/pug-lexer/test/__snapshots__/index.test.js.snap
@@ -34270,6 +34270,277 @@ Array [
 ]
 `;
 
+exports[`mixin-block-interpolation.pug 1`] = `
+Array [
+  Object {
+    "args": null,
+    "loc": Object {
+      "end": Object {
+        "column": 10,
+        "line": 1,
+      },
+      "filename": "<basedir>/packages/pug-lexer/test/cases/mixin-block-interpolation.pug",
+      "start": Object {
+        "column": 1,
+        "line": 1,
+      },
+    },
+    "type": "mixin",
+    "val": "a",
+  },
+  Object {
+    "loc": Object {
+      "end": Object {
+        "column": 5,
+        "line": 2,
+      },
+      "filename": "<basedir>/packages/pug-lexer/test/cases/mixin-block-interpolation.pug",
+      "start": Object {
+        "column": 1,
+        "line": 2,
+      },
+    },
+    "type": "indent",
+    "val": 4,
+  },
+  Object {
+    "loc": Object {
+      "end": Object {
+        "column": 9,
+        "line": 2,
+      },
+      "filename": "<basedir>/packages/pug-lexer/test/cases/mixin-block-interpolation.pug",
+      "start": Object {
+        "column": 5,
+        "line": 2,
+      },
+    },
+    "type": "tag",
+    "val": "span",
+  },
+  Object {
+    "loc": Object {
+      "end": Object {
+        "column": 22,
+        "line": 2,
+      },
+      "filename": "<basedir>/packages/pug-lexer/test/cases/mixin-block-interpolation.pug",
+      "start": Object {
+        "column": 10,
+        "line": 2,
+      },
+    },
+    "type": "text",
+    "val": "This should ",
+  },
+  Object {
+    "loc": Object {
+      "end": Object {
+        "column": 24,
+        "line": 2,
+      },
+      "filename": "<basedir>/packages/pug-lexer/test/cases/mixin-block-interpolation.pug",
+      "start": Object {
+        "column": 22,
+        "line": 2,
+      },
+    },
+    "type": "start-pug-interpolation",
+  },
+  Object {
+    "loc": Object {
+      "end": Object {
+        "column": 29,
+        "line": 2,
+      },
+      "filename": "<basedir>/packages/pug-lexer/test/cases/mixin-block-interpolation.pug",
+      "start": Object {
+        "column": 24,
+        "line": 2,
+      },
+    },
+    "type": "tag",
+    "val": "block",
+  },
+  Object {
+    "loc": Object {
+      "end": Object {
+        "column": 30,
+        "line": 2,
+      },
+      "filename": "<basedir>/packages/pug-lexer/test/cases/mixin-block-interpolation.pug",
+      "start": Object {
+        "column": 29,
+        "line": 2,
+      },
+    },
+    "type": "end-pug-interpolation",
+  },
+  Object {
+    "loc": Object {
+      "end": Object {
+        "column": 30,
+        "line": 2,
+      },
+      "filename": "<basedir>/packages/pug-lexer/test/cases/mixin-block-interpolation.pug",
+      "start": Object {
+        "column": 30,
+        "line": 2,
+      },
+    },
+    "type": "text",
+    "val": "",
+  },
+  Object {
+    "loc": Object {
+      "end": Object {
+        "column": 5,
+        "line": 3,
+      },
+      "filename": "<basedir>/packages/pug-lexer/test/cases/mixin-block-interpolation.pug",
+      "start": Object {
+        "column": 1,
+        "line": 3,
+      },
+    },
+    "type": "newline",
+  },
+  Object {
+    "loc": Object {
+      "end": Object {
+        "column": 6,
+        "line": 3,
+      },
+      "filename": "<basedir>/packages/pug-lexer/test/cases/mixin-block-interpolation.pug",
+      "start": Object {
+        "column": 5,
+        "line": 3,
+      },
+    },
+    "type": "tag",
+    "val": "p",
+  },
+  Object {
+    "loc": Object {
+      "end": Object {
+        "column": 16,
+        "line": 3,
+      },
+      "filename": "<basedir>/packages/pug-lexer/test/cases/mixin-block-interpolation.pug",
+      "start": Object {
+        "column": 7,
+        "line": 3,
+      },
+    },
+    "type": "text",
+    "val": "Next line",
+  },
+  Object {
+    "loc": Object {
+      "end": Object {
+        "column": 1,
+        "line": 5,
+      },
+      "filename": "<basedir>/packages/pug-lexer/test/cases/mixin-block-interpolation.pug",
+      "start": Object {
+        "column": 1,
+        "line": 5,
+      },
+    },
+    "type": "outdent",
+  },
+  Object {
+    "args": "",
+    "loc": Object {
+      "end": Object {
+        "column": 5,
+        "line": 5,
+      },
+      "filename": "<basedir>/packages/pug-lexer/test/cases/mixin-block-interpolation.pug",
+      "start": Object {
+        "column": 1,
+        "line": 5,
+      },
+    },
+    "type": "call",
+    "val": "a",
+  },
+  Object {
+    "loc": Object {
+      "end": Object {
+        "column": 5,
+        "line": 6,
+      },
+      "filename": "<basedir>/packages/pug-lexer/test/cases/mixin-block-interpolation.pug",
+      "start": Object {
+        "column": 1,
+        "line": 6,
+      },
+    },
+    "type": "indent",
+    "val": 4,
+  },
+  Object {
+    "loc": Object {
+      "end": Object {
+        "column": 6,
+        "line": 6,
+      },
+      "filename": "<basedir>/packages/pug-lexer/test/cases/mixin-block-interpolation.pug",
+      "start": Object {
+        "column": 5,
+        "line": 6,
+      },
+    },
+    "type": "tag",
+    "val": "b",
+  },
+  Object {
+    "loc": Object {
+      "end": Object {
+        "column": 11,
+        "line": 6,
+      },
+      "filename": "<basedir>/packages/pug-lexer/test/cases/mixin-block-interpolation.pug",
+      "start": Object {
+        "column": 7,
+        "line": 6,
+      },
+    },
+    "type": "text",
+    "val": "work",
+  },
+  Object {
+    "loc": Object {
+      "end": Object {
+        "column": 11,
+        "line": 6,
+      },
+      "filename": "<basedir>/packages/pug-lexer/test/cases/mixin-block-interpolation.pug",
+      "start": Object {
+        "column": 11,
+        "line": 6,
+      },
+    },
+    "type": "outdent",
+  },
+  Object {
+    "loc": Object {
+      "end": Object {
+        "column": 11,
+        "line": 6,
+      },
+      "filename": "<basedir>/packages/pug-lexer/test/cases/mixin-block-interpolation.pug",
+      "start": Object {
+        "column": 11,
+        "line": 6,
+      },
+    },
+    "type": "eos",
+  },
+]
+`;
+
 exports[`mixin-block-with-space.pug 1`] = `
 Array [
   Object {
diff --git a/packages/pug-lexer/test/cases/mixin-block-interpolation.pug b/packages/pug-lexer/test/cases/mixin-block-interpolation.pug
new file mode 100644
index 000000000..1043d389b
--- /dev/null
+++ b/packages/pug-lexer/test/cases/mixin-block-interpolation.pug
@@ -0,0 +1,6 @@
+mixin a()
+    span This should #[block]
+    p Next line
+
++a()
+    b work
\ No newline at end of file
diff --git a/packages/pug/test/mixin-block-interpolation/__snapshots__/index.test.js.snap b/packages/pug/test/mixin-block-interpolation/__snapshots__/index.test.js.snap
new file mode 100644
index 000000000..8a89bc0ff
--- /dev/null
+++ b/packages/pug/test/mixin-block-interpolation/__snapshots__/index.test.js.snap
@@ -0,0 +1,7 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`mixin block tag interpolation 1`] = `
+"<span>proof that 
+  <block></block></span>
+<p>another paragraph</p>"
+`;
diff --git a/packages/pug/test/mixin-block-interpolation/index.pug b/packages/pug/test/mixin-block-interpolation/index.pug
new file mode 100644
index 000000000..0aa06e9f9
--- /dev/null
+++ b/packages/pug/test/mixin-block-interpolation/index.pug
@@ -0,0 +1,6 @@
+mixin a()
+    span proof that #[block]
+    p another paragraph
+
++a()
+    b this prints
\ No newline at end of file
diff --git a/packages/pug/test/mixin-block-interpolation/index.test.js b/packages/pug/test/mixin-block-interpolation/index.test.js
new file mode 100644
index 000000000..2a3725efe
--- /dev/null
+++ b/packages/pug/test/mixin-block-interpolation/index.test.js
@@ -0,0 +1,9 @@
+const pug = require('../../');
+
+test('mixin block tag interpolation', () => {
+    const output = pug.renderFile(
+        __dirname + '/index.pug',
+        {pretty: true}
+    );
+    expect(output).toMatchSnapshot();
+});
\ No newline at end of file
diff --git a/yarn.lock b/yarn.lock
index 01a516311..b6563fed8 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -5468,7 +5468,7 @@ token-stream@0.0.1:
   version "0.0.1"
   resolved "https://registry.yarnpkg.com/token-stream/-/token-stream-0.0.1.tgz#ceeefc717a76c4316f126d0b9dbaa55d7e7df01a"
 
-tough-cookie@>=2.3.4:
+tough-cookie@>=2.3.3:
   version "3.0.1"
   resolved "https://registry.yarnpkg.com/tough-cookie/-/tough-cookie-3.0.1.tgz#9df4f57e739c26930a018184887f4adb7dca73b2"
   integrity sha512-yQyJ0u4pZsv9D4clxO69OEjLWYw+jbgspjTue4lTQZLfV0c5l1VmK2y1JK8E9ahdpltPOaAThPcp5nKPUgSnsg==