diff --git a/MdePkg/Library/BaseIoLibIntrinsic/IoLibMsc.c b/MdePkg/Library/BaseIoLibIntrinsic/IoLibMsc.c
index 6f076f7578..9fec1bcae9 100644
--- a/MdePkg/Library/BaseIoLibIntrinsic/IoLibMsc.c
+++ b/MdePkg/Library/BaseIoLibIntrinsic/IoLibMsc.c
@@ -36,7 +36,6 @@ unsigned short _outpw (unsigned short port, unsigned short dataword );
 unsigned long  _outpd (unsigned short port, unsigned long dataword );
 void          _ReadWriteBarrier (void);
 
-#ifdef _MSC_VER
 #pragma intrinsic(_inp)
 #pragma intrinsic(_inpw)
 #pragma intrinsic(_inpd)
@@ -44,7 +43,7 @@ void          _ReadWriteBarrier (void);
 #pragma intrinsic(_outpw)
 #pragma intrinsic(_outpd)
 #pragma intrinsic(_ReadWriteBarrier)
-#endif 
+
 //
 // _ReadWriteBarrier() forces memory reads and writes to complete at the point
 // in the call. This is only a hint to the compiler and does emit code.