diff --git a/example/yarn.lock b/example/yarn.lock
index 0e3ba13..8c6d671 100644
--- a/example/yarn.lock
+++ b/example/yarn.lock
@@ -2120,7 +2120,11 @@ deep-is@~0.1.3:
   version "0.1.3"
   resolved "https://registry.yarnpkg.com/deep-is/-/deep-is-0.1.3.tgz#b369d6fb5dbc13eecf524f91b070feedc357cf34"
 
-deepmerge@2.1.0, deepmerge@^1.3.0, deepmerge@^1.5.1, deepmerge@^2.1.0:
+deepmerge@^1.3.0, deepmerge@^1.5.1:
+  version "1.5.2"
+  resolved "https://registry.yarnpkg.com/deepmerge/-/deepmerge-1.5.2.tgz#10499d868844cdad4fee0842df8c7f6f0c95a753"
+
+deepmerge@^2.1.0:
   version "2.1.0"
   resolved "https://registry.yarnpkg.com/deepmerge/-/deepmerge-2.1.0.tgz#511a54fff405fc346f0240bb270a3e9533a31102"
 
@@ -3012,7 +3016,7 @@ hoek@4.x.x:
   version "4.2.1"
   resolved "https://registry.yarnpkg.com/hoek/-/hoek-4.2.1.tgz#9634502aa12c445dd5a7c5734b572bb8738aacbb"
 
-hoist-non-react-statics@2.5.0, hoist-non-react-statics@^2.2.0, hoist-non-react-statics@^2.3.1, hoist-non-react-statics@^2.5.0:
+hoist-non-react-statics@^2.2.0, hoist-non-react-statics@^2.3.1, hoist-non-react-statics@^2.5.0:
   version "2.5.0"
   resolved "https://registry.yarnpkg.com/hoist-non-react-statics/-/hoist-non-react-statics-2.5.0.tgz#d2ca2dfc19c5a91c5a6615ce8e564ef0347e2a40"
 
@@ -4870,7 +4874,7 @@ react-google-maps@^7.3.0:
     scriptjs "2.5.8"
     warning "3.0.0"
 
-react-lifecycles-compat@3.0.4, react-lifecycles-compat@^3, react-lifecycles-compat@^3.0.4:
+react-lifecycles-compat@^3, react-lifecycles-compat@^3.0.4:
   version "3.0.4"
   resolved "https://registry.yarnpkg.com/react-lifecycles-compat/-/react-lifecycles-compat-3.0.4.tgz#4f1a273afdfc8f3488a8c516bfda78f872352362"
 
diff --git a/src/components/Portal/PortalHost.js b/src/components/Portal/PortalHost.js
index 8b4f4f0..c0a3140 100644
--- a/src/components/Portal/PortalHost.js
+++ b/src/components/Portal/PortalHost.js
@@ -49,6 +49,10 @@ export default class PortalHost extends React.Component<Props> {
     }
   }
 
+  _setManager = (manager: ?Object) => {
+    this._manager = manager;
+  };
+
   _mount = (children: React.Node) => {
     const key = this._nextKey++;
 
@@ -101,11 +105,7 @@ export default class PortalHost extends React.Component<Props> {
         }}
       >
         {this.props.children}
-        <PortalManager
-          ref={c => {
-            this._manager = c;
-          }}
-        />
+        <PortalManager ref={this._setManager} />
       </PortalContext.Provider>
     );
   }