diff --git a/interfaces/USB/class/ccid/ccid.c b/interfaces/USB/class/ccid/ccid.c
index 33728fe7..45bd21bd 100644
--- a/interfaces/USB/class/ccid/ccid.c
+++ b/interfaces/USB/class/ccid/ccid.c
@@ -52,6 +52,7 @@ uint8_t CCID_Response_SendData(const uint8_t *buf, uint16_t len, uint8_t is_time
       return 0;
     else
       device_delay(1);
+    tud_task_ext(0, false);
   }
   if (is_time_extension_request)
     bulkin_state = CCID_STATE_DATA_IN_TIME_EXTENSION;
diff --git a/interfaces/USB/class/ctaphid/ctaphid.c b/interfaces/USB/class/ctaphid/ctaphid.c
index 2b8218da..80663187 100644
--- a/interfaces/USB/class/ctaphid/ctaphid.c
+++ b/interfaces/USB/class/ctaphid/ctaphid.c
@@ -32,6 +32,7 @@ void CTAPHID_SendReport(uint8_t *report, uint16_t len) {
       return;
     }
 
+    tud_task_ext(0, false);
     device_delay(1);
   }