diff --git a/packages/babel-generator/src/generators/flow.js b/packages/babel-generator/src/generators/flow.js
index 20d29d7cc4..decdde9d74 100644
--- a/packages/babel-generator/src/generators/flow.js
+++ b/packages/babel-generator/src/generators/flow.js
@@ -104,6 +104,10 @@ export function _interfaceish(node: Object) {
     this.push(" extends ");
     this.printJoin(node.extends, node, { separator: ", " });
   }
+  if (node.mixins.length) {
+    this.push(" mixins ");
+    this.printJoin(node.mixins, node, { separator: ", " });
+  }
   this.space();
   this.print(node.body, node);
 }
diff --git a/packages/babel-generator/test/fixtures/flow/declare-statements/actual.js b/packages/babel-generator/test/fixtures/flow/declare-statements/actual.js
index 369f608fa2..0a6f430654 100644
--- a/packages/babel-generator/test/fixtures/flow/declare-statements/actual.js
+++ b/packages/babel-generator/test/fixtures/flow/declare-statements/actual.js
@@ -9,3 +9,4 @@ declare class A<T> extends B<T> { x: number }
 declare class A { static foo(): number; static x : string }
 declare class A { static [ indexer: number]: string }
 declare class A { static () : number }
+declare class A mixins B<T>, C {}
diff --git a/packages/babel-generator/test/fixtures/flow/declare-statements/expected.js b/packages/babel-generator/test/fixtures/flow/declare-statements/expected.js
index 323cc86f70..840c9b4004 100644
--- a/packages/babel-generator/test/fixtures/flow/declare-statements/expected.js
+++ b/packages/babel-generator/test/fixtures/flow/declare-statements/expected.js
@@ -9,3 +9,4 @@ declare class A<T> extends B<T> { x: number }
 declare class A { static foo(): number; static x: string; }
 declare class A { static [indexer: number]: string }
 declare class A { static (): number }
+declare class A mixins B<T>, C {}