diff --git a/flow-typed/babel.js.flow b/flow-typed/babel.js.flow
index 9b1d4eaf..c3f0ef18 100644
--- a/flow-typed/babel.js.flow
+++ b/flow-typed/babel.js.flow
@@ -158,7 +158,7 @@ declare module 'babel-generator' {
     ast: BabelNode,
     options?: GeneratorOptions,
     code?: string | {[string]: string},
-  ) => GeneratorResult
+  ) => GeneratorResult;
 }
 
 // #############################################
@@ -205,7 +205,7 @@ type BabelCoreOptions = {|
   moduleRoot?: string,
   only?: ?(string | Array<string> | RegExp | Array<string | RegExp>),
   parserOpts?: ?Babylon7Options,
-  plugins?: _Plugins,
+  plugins?: ?_Plugins,
   presets?: Array<string>,
   retainLines?: boolean,
   shouldPrintComment?: ?(string) => boolean,
@@ -329,7 +329,7 @@ declare module '@babel/generator' {
     ast: BabelNode,
     options?: GeneratorOptions,
     code?: string | {|[filename: string]: string|},
-  ) => GeneratorResult
+  ) => GeneratorResult;
 }
 
 // https://github.com/babel/babel/tree/master/packages/babel-template