1 files changed, 4 insertions, 7 deletions
diff --git a/win/tclWinThrd.c b/win/tclWinThrd.c
index 987734d..dbc5f26 100644
--- a/win/tclWinThrd.c
+++ b/win/tclWinThrd.c
@@ -164,7 +164,6 @@ TclWinThreadStart(
 				 * from TclpThreadCreate */
 {
     WinThread *winThreadPtr = (WinThread *) lpParameter;
-    unsigned int fpmask;
     LPTHREAD_START_ROUTINE lpOrigStartAddress;
     LPVOID lpOrigParameter;
 
@@ -172,13 +171,11 @@ TclWinThreadStart(
 	return TCL_ERROR;
     }
 
-    fpmask = _MCW_EM | _MCW_RC | _MCW_PC;
-
-#if defined(_MSC_VER) && _MSC_VER >= 1200
-    fpmask |= _MCW_DN;
+    _controlfp(winThreadPtr->fpControl, _MCW_EM | _MCW_RC | 0x03000000 /* _MCW_DN */
+#if !defined(_WIN64)
+	    | _MCW_PC
 #endif
-
-    _controlfp(winThreadPtr->fpControl, fpmask);
+    );
 
     lpOrigStartAddress = winThreadPtr->lpStartAddress;
     lpOrigParameter = winThreadPtr->lpParameter;