diff --git a/src/Injector.js b/src/Injector.js
index 95880bd..258c8f7 100644
--- a/src/Injector.js
+++ b/src/Injector.js
@@ -21,9 +21,6 @@ const Injector = ({ into } = {}) => {
     // Error message
     invalidTargetMsg);
 
-  injectorIndex++;
-  const injectorId = `injector_${injectorIndex}`;
-
   return function WrapComponent(InjectionComponent) {
     invariant(
       InjectionComponent &&
@@ -31,6 +28,9 @@ const Injector = ({ into } = {}) => {
       invalidInjectMsg
     );
 
+    injectorIndex++;
+    const injectorId = `injector_${injectorIndex}`;
+
     class InjectorComponent extends Component {
       static contextTypes = {
         registerInjector: PropTypes.func.isRequired,