diff --git a/local-cli/bundle/buildBundle.js b/local-cli/bundle/buildBundle.js
index 123cb6b76..3376abf75 100644
--- a/local-cli/bundle/buildBundle.js
+++ b/local-cli/bundle/buildBundle.js
@@ -84,6 +84,7 @@ function buildBundle(
       globalTransformCache: null,
       hasteImpl: config.hasteImpl,
       platforms: defaultPlatforms.concat(platforms),
+      postMinifyProcess: config.postMinifyProcess,
       postProcessModules: config.postProcessModules,
       projectRoots: config.getProjectRoots(),
       providesModuleNodeModules: providesModuleNodeModules,
diff --git a/packager/src/Bundler/index.js b/packager/src/Bundler/index.js
index 58531819b..da622d9c7 100644
--- a/packager/src/Bundler/index.js
+++ b/packager/src/Bundler/index.js
@@ -127,7 +127,7 @@ type Options = {|
   +platforms: Array<string>,
   +polyfillModuleNames: Array<string>,
   +postProcessModules?: PostProcessModules,
-  +postMinifyProcess?: PostMinifyProcess,
+  +postMinifyProcess: PostMinifyProcess,
   +projectRoots: Array<string>,
   +providesModuleNodeModules?: Array<string>,
   +reporter: Reporter,
diff --git a/packager/src/Resolver/index.js b/packager/src/Resolver/index.js
index 476ef3ae5..c3dbe177c 100644
--- a/packager/src/Resolver/index.js
+++ b/packager/src/Resolver/index.js
@@ -39,7 +39,7 @@ type Options = {|
   +hasteImpl?: HasteImpl,
   +maxWorkerCount: number,
   +minifyCode: MinifyCode,
-  +postMinifyProcess?: PostMinifyProcess,
+  +postMinifyProcess: PostMinifyProcess,
   +platforms: Set<string>,
   +polyfillModuleNames?: Array<string>,
   +projectRoots: Array<string>,
@@ -55,7 +55,7 @@ class Resolver {
 
   _depGraph: DependencyGraph;
   _minifyCode: MinifyCode;
-  _postMinifyProcess: ?PostMinifyProcess;
+  _postMinifyProcess: PostMinifyProcess;
   _polyfillModuleNames: Array<string>;
 
   constructor(opts: Options, depGraph: DependencyGraph) {
diff --git a/packager/src/Server/index.js b/packager/src/Server/index.js
index 8bd3f8917..63732ee06 100644
--- a/packager/src/Server/index.js
+++ b/packager/src/Server/index.js
@@ -68,7 +68,7 @@ type Options = {
   platforms?: Array<string>,
   polyfillModuleNames?: Array<string>,
   postProcessModules?: PostProcessModules,
-  postMinifyProcess?: PostMinifyProcess,
+  postMinifyProcess: PostMinifyProcess,
   projectRoots: Array<string>,
   providesModuleNodeModules?: Array<string>,
   reporter: Reporter,
@@ -124,7 +124,7 @@ class Server {
     platforms: Array<string>,
     polyfillModuleNames: Array<string>,
     postProcessModules?: PostProcessModules,
-    postMinifyProcess?: PostMinifyProcess,
+    postMinifyProcess: PostMinifyProcess,
     projectRoots: Array<string>,
     providesModuleNodeModules?: Array<string>,
     reporter: Reporter,