diff --git a/EdkUnixPkg/Sec/UgaX11.c b/EdkUnixPkg/Sec/UgaX11.c
index b5719cfd59..47fb4fab7a 100644
--- a/EdkUnixPkg/Sec/UgaX11.c
+++ b/EdkUnixPkg/Sec/UgaX11.c
@@ -13,6 +13,8 @@
 #include <stdio.h>
 #include <stdlib.h>
 
+extern void msSleep (unsigned long Milliseconds);
+
 /* XQueryPointer  */
 
 struct uga_drv_shift_mask
@@ -347,7 +349,7 @@ UgaCheckKey(EFI_UNIX_UGA_IO_PROTOCOL *UgaIo)
     return EFI_SUCCESS;
   else {
     /* EFI is certainly polling.  Be CPU-friendly.  */
-    usleep (50000);
+    msSleep (20);
     return EFI_NOT_READY;
   }
 }
diff --git a/EdkUnixPkg/Sec/UnixThunk.c b/EdkUnixPkg/Sec/UnixThunk.c
index 46b0e34c55..c1988faf59 100644
--- a/EdkUnixPkg/Sec/UnixThunk.c
+++ b/EdkUnixPkg/Sec/UnixThunk.c
@@ -89,6 +89,18 @@ SetTimer (UINT64 PeriodMs, VOID (*CallBack)(UINT64 DeltaMs))
   settimer_callback = CallBack;
 }
 
+void
+msSleep (unsigned long Milliseconds)
+{
+  struct timespec ts;
+
+  ts.tv_sec = Milliseconds / 1000;
+  ts.tv_nsec = (Milliseconds % 1000) * 1000000;
+
+  while (nanosleep (&ts, &ts) != 0 && errno == EINTR)
+    ;
+}
+
 void
 GetLocalTime (EFI_TIME *Time)
 {
@@ -110,12 +122,6 @@ GetLocalTime (EFI_TIME *Time)
     | (tm->tm_isdst > 0 ? EFI_TIME_IN_DAYLIGHT : 0);
 }
 
-void
-msSleep (unsigned long Milliseconds)
-{
-  usleep (Milliseconds * 1000);
-}
-
 static void
 TzSet (void)
 {