diff --git a/packages/babel-generator/src/node/parentheses.js b/packages/babel-generator/src/node/parentheses.js
index 7fe20066a2..2e84c78ca1 100644
--- a/packages/babel-generator/src/node/parentheses.js
+++ b/packages/babel-generator/src/node/parentheses.js
@@ -93,6 +93,17 @@ export function Binary(node: Object, parent: Object): boolean {
   return false;
 }
 
+export function UnionTypeAnnotation(node: Object, parent: Object): boolean {
+  return (
+    t.isArrayTypeAnnotation(parent) ||
+    t.isNullableTypeAnnotation(parent) ||
+    t.isIntersectionTypeAnnotation(parent) ||
+    t.isUnionTypeAnnotation(parent)
+  );
+}
+
+export { UnionTypeAnnotation as IntersectionTypeAnnotation };
+
 export function TSAsExpression() {
   return true;
 }
diff --git a/packages/babel-generator/test/fixtures/flow/type-union-intersection/actual.js b/packages/babel-generator/test/fixtures/flow/type-union-intersection/actual.js
new file mode 100644
index 0000000000..1a82196a16
--- /dev/null
+++ b/packages/babel-generator/test/fixtures/flow/type-union-intersection/actual.js
@@ -0,0 +1,10 @@
+type foo = ?(a | b);
+type foo2 = ?(a & b);
+type foo3 = (a | b)[];
+type foo4 = (a & b)[];
+type foo5 = a | b | c;
+type foo6 = a & b & c;
+type foo7 = a & b | c;
+type foo8 = a | b & c;
+type foo9 = a & (b | c);
+type foo10 = (a | b) & c;
diff --git a/packages/babel-generator/test/fixtures/flow/type-union-intersection/expected.js b/packages/babel-generator/test/fixtures/flow/type-union-intersection/expected.js
new file mode 100644
index 0000000000..0ac15dc681
--- /dev/null
+++ b/packages/babel-generator/test/fixtures/flow/type-union-intersection/expected.js
@@ -0,0 +1,10 @@
+type foo = ?(a | b);
+type foo2 = ?(a & b);
+type foo3 = (a | b)[];
+type foo4 = (a & b)[];
+type foo5 = a | b | c;
+type foo6 = a & b & c;
+type foo7 = (a & b) | c;
+type foo8 = a | (b & c);
+type foo9 = a & (b | c);
+type foo10 = (a | b) & c;
\ No newline at end of file
diff --git a/yarn.lock b/yarn.lock
index 1555f0cff2..0b0b22e9d5 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -1017,9 +1017,9 @@ babylon@7.0.0-beta.18:
   version "7.0.0-beta.18"
   resolved "https://registry.yarnpkg.com/babylon/-/babylon-7.0.0-beta.18.tgz#5c23ee3fdb66358aabf3789779319c5b78a233c7"
 
-babylon@7.0.0-beta.25:
-  version "7.0.0-beta.25"
-  resolved "https://registry.yarnpkg.com/babylon/-/babylon-7.0.0-beta.25.tgz#5fff5062b7082203b1bc5cab488e154cfee0202a"
+babylon@7.0.0-beta.26:
+  version "7.0.0-beta.26"
+  resolved "https://registry.yarnpkg.com/babylon/-/babylon-7.0.0-beta.26.tgz#afc2c6b86113d000cc9476fd6f73e2a9223de8f7"
 
 babylon@^6.17.4, babylon@^6.18.0:
   version "6.18.0"