diff --git a/src/posix/platform/radio_spinel.cpp b/src/posix/platform/radio_spinel.cpp
index f7102a630..8cd57df8a 100644
--- a/src/posix/platform/radio_spinel.cpp
+++ b/src/posix/platform/radio_spinel.cpp
@@ -680,24 +680,16 @@ void RadioSpinel::UpdateFdSet(fd_set &aReadFdSet, fd_set &aWriteFdSet, int &aMax
 {
     int sockFd = mHdlcInterface.GetSocket();
 
-    if ((mState != kStateTransmitPending) && (mState != kStateTransmitDone))
-    {
-        FD_SET(sockFd, &aReadFdSet);
+    FD_SET(sockFd, &aReadFdSet);
 
-        if (aMaxFd < sockFd)
-        {
-            aMaxFd = sockFd;
-        }
+    if (aMaxFd < sockFd)
+    {
+        aMaxFd = sockFd;
     }
 
     if (mState == kStateTransmitPending)
     {
         FD_SET(sockFd, &aWriteFdSet);
-
-        if (aMaxFd < sockFd)
-        {
-            aMaxFd = sockFd;
-        }
     }
 
     if (!mFrameQueue.IsEmpty() || (mState == kStateTransmitDone))