diff --git a/dix/dispatch.c b/dix/dispatch.c
index 2df1a6ea5..99ba277fb 100644
--- a/dix/dispatch.c
+++ b/dix/dispatch.c
@@ -223,7 +223,11 @@ UpdateCurrentTimeIf(void)
 #define SMART_SCHEDULE_DEFAULT_INTERVAL	20      /* ms */
 #define SMART_SCHEDULE_MAX_SLICE	200     /* ms */
 
+#if defined(WIN32) && !defined(__CYGWIN__)
+Bool SmartScheduleDisable = TRUE;
+#else
 Bool SmartScheduleDisable = FALSE;
+#endif
 long SmartScheduleSlice = SMART_SCHEDULE_DEFAULT_INTERVAL;
 long SmartScheduleInterval = SMART_SCHEDULE_DEFAULT_INTERVAL;
 long SmartScheduleMaxSlice = SMART_SCHEDULE_MAX_SLICE;
diff --git a/os/utils.c b/os/utils.c
index 411daa047..6f75c1704 100644
--- a/os/utils.c
+++ b/os/utils.c
@@ -71,6 +71,7 @@ __stdcall unsigned long GetTickCount(void);
 #if !defined(WIN32) || !defined(__MINGW32__)
 #include <sys/time.h>
 #include <sys/resource.h>
+# define SMART_SCHEDULE_POSSIBLE
 #endif
 #include "misc.h"
 #include <X11/X.h>
@@ -898,6 +899,7 @@ ProcessCommandLine(int argc, char *argv[])
             i = skip - 1;
         }
 #endif
+#ifdef SMART_SCHEDULE_POSSIBLE
         else if (strcmp(argv[i], "-dumbSched") == 0) {
             SmartScheduleDisable = TRUE;
         }
@@ -916,6 +918,7 @@ ProcessCommandLine(int argc, char *argv[])
             else
                 UseMsg();
         }
+#endif
         else if (strcmp(argv[i], "-render") == 0) {
             if (++i < argc) {
                 int policy = PictureParseCmapPolicy(argv[i]);
@@ -1127,6 +1130,7 @@ XNFstrdup(const char *s)
 void
 SmartScheduleStopTimer(void)
 {
+#ifdef SMART_SCHEDULE_POSSIBLE
     struct itimerval timer;
 
     if (SmartScheduleDisable)
@@ -1136,11 +1140,13 @@ SmartScheduleStopTimer(void)
     timer.it_value.tv_sec = 0;
     timer.it_value.tv_usec = 0;
     (void) setitimer(ITIMER_REAL, &timer, 0);
+#endif
 }
 
 void
 SmartScheduleStartTimer(void)
 {
+#ifdef SMART_SCHEDULE_POSSIBLE
     struct itimerval timer;
 
     if (SmartScheduleDisable)
@@ -1150,6 +1156,7 @@ SmartScheduleStartTimer(void)
     timer.it_value.tv_sec = 0;
     timer.it_value.tv_usec = SmartScheduleInterval * 1000;
     setitimer(ITIMER_REAL, &timer, 0);
+#endif
 }
 
 static void
@@ -1161,6 +1168,7 @@ SmartScheduleTimer(int sig)
 void
 SmartScheduleInit(void)
 {
+#ifdef SMART_SCHEDULE_POSSIBLE
     struct sigaction act;
 
     if (SmartScheduleDisable)
@@ -1176,6 +1184,7 @@ SmartScheduleInit(void)
         perror("sigaction for smart scheduler");
         SmartScheduleDisable = TRUE;
     }
+#endif
 }
 
 #ifdef SIG_BLOCK