diff --git a/packages/physics/traits/emitter.trait.js b/packages/physics/traits/emitter.trait.js
index 10f1274..c8fde92 100644
--- a/packages/physics/traits/emitter.trait.js
+++ b/packages/physics/traits/emitter.trait.js
@@ -161,11 +161,11 @@ export class Emitter extends decorate(Trait) {
       },
 
       emitParticleJson: (json) => {
-        return K.stream((emitter) => {
-          let {
-            count = 1,
-            rate = 0,
-          } = json;
+        let {
+          count = 1,
+          rate = 0,
+        } = json;
+        const stream = K.stream((emitter) => {
           if (0 === rate) {
             for (let i = 0; i < count; ++i) {
               this.emitParticleJson(json, emitter);