diff --git a/ktor-client/ktor-client-curl/desktop/src/io/ktor/client/engine/curl/internal/CurlCallbacks.kt b/ktor-client/ktor-client-curl/desktop/src/io/ktor/client/engine/curl/internal/CurlCallbacks.kt
index 573729a8255..8a99eabcbf0 100644
--- a/ktor-client/ktor-client-curl/desktop/src/io/ktor/client/engine/curl/internal/CurlCallbacks.kt
+++ b/ktor-client/ktor-client-curl/desktop/src/io/ktor/client/engine/curl/internal/CurlCallbacks.kt
@@ -69,7 +69,7 @@ internal fun onBodyChunkRequested(
         return if (body.closedCause != null) -1 else 0
     }
     val readCount = try {
-        body.readAvailable(1) { source: Buffer ->
+        body.readAvailable(1) { source ->
             source.readAvailable(buffer, 0, requested)
         }
     } catch (cause: Throwable) {