diff --git a/utils/pinprocfw/pinprocfw.cpp b/utils/pinprocfw/pinprocfw.cpp
index 3d53160..5bc5aba 100644
--- a/utils/pinprocfw/pinprocfw.cpp
+++ b/utils/pinprocfw/pinprocfw.cpp
@@ -555,7 +555,8 @@ void waitTime(long microsec)
         // Read the JTAG status register to exercise the USB bus
         PRJTAGGetStatus(proc, &jtagStatus);
 
-        sleep( ( microsec - 2000L ) / 1000000L);
+        PRSleep( ( microsec - 2000L ) / 1000L);
+        //sleep( ( microsec - 2000L ) / 1000000L);
     }
     else    /* Satisfy FPGA JTAG configuration, startup TCK cycles */
     {
@@ -568,6 +569,7 @@ void waitTime(long microsec)
           PRJTAGGetStatus(proc, &jtagStatus);
         }
         //{
+        //PRSleep( ( microsec + 19999L ) / 1000L );
         //sleep( ( microsec + 19999L ) / 1000000L );
         //sleep( 1 );
             //pulseClock();
diff --git a/utils/pinprocfw/pinprocfw.h b/utils/pinprocfw/pinprocfw.h
index ece2544..27f0c5b 100644
--- a/utils/pinprocfw/pinprocfw.h
+++ b/utils/pinprocfw/pinprocfw.h
@@ -13,6 +13,13 @@
 #ifndef PINPROCFW_H
 #define PINPROCFW_H
 
+#if defined(__WIN32__)
+    #include <windows.h>
+    #define PRSleep(milliseconds) Sleep(milliseconds)
+#else
+    #define PRSleep(milliseconds) sleep(milliseconds/1000)
+#endif
+
 /* Legacy error codes for xsvfExecute from original XSVF player v2.0 */
 #define XSVF_LEGACY_SUCCESS 1
 #define XSVF_LEGACY_ERROR   0