diff --git a/matrix-sdk-android-rx/src/main/java/org/matrix/android/sdk/rx/RxCallbackBuilders.kt b/matrix-sdk-android-rx/src/main/java/org/matrix/android/sdk/rx/RxCallbackBuilders.kt
index f6dbe3d160..d5bb53e9c9 100644
--- a/matrix-sdk-android-rx/src/main/java/org/matrix/android/sdk/rx/RxCallbackBuilders.kt
+++ b/matrix-sdk-android-rx/src/main/java/org/matrix/android/sdk/rx/RxCallbackBuilders.kt
@@ -21,34 +21,34 @@ import org.matrix.android.sdk.api.util.Cancelable
 import io.reactivex.Completable
 import io.reactivex.Single
 
-fun <T> singleBuilder(builder: (callback: MatrixCallback<T>) -> Cancelable): Single<T> = Single.create {
-    val callback: MatrixCallback<T> = object : MatrixCallback<T> {
+fun <T> singleBuilder(builder: (MatrixCallback<T>) -> Cancelable): Single<T> = Single.create { emitter ->
+    val callback = object : MatrixCallback<T> {
         override fun onSuccess(data: T) {
-            it.onSuccess(data)
+            emitter.onSuccess(data)
         }
 
         override fun onFailure(failure: Throwable) {
-            it.tryOnError(failure)
+            emitter.tryOnError(failure)
         }
     }
     val cancelable = builder(callback)
-    it.setCancellable {
+    emitter.setCancellable {
         cancelable.cancel()
     }
 }
 
-fun <T> completableBuilder(builder: (callback: MatrixCallback<T>) -> Cancelable): Completable = Completable.create {
-    val callback: MatrixCallback<T> = object : MatrixCallback<T> {
+fun <T> completableBuilder(builder: (MatrixCallback<T>) -> Cancelable): Completable = Completable.create { emitter ->
+    val callback = object : MatrixCallback<T> {
         override fun onSuccess(data: T) {
-            it.onComplete()
+            emitter.onComplete()
         }
 
         override fun onFailure(failure: Throwable) {
-            it.tryOnError(failure)
+            emitter.tryOnError(failure)
         }
     }
     val cancelable = builder(callback)
-    it.setCancellable {
+    emitter.setCancellable {
         cancelable.cancel()
     }
 }