diff --git a/uisimulator/app.c b/uisimulator/app.c
index a9456664c4..8ef6da9397 100644
--- a/uisimulator/app.c
+++ b/uisimulator/app.c
@@ -26,9 +26,6 @@
 
 #ifdef SIMULATOR
 #include <stdio.h>
-#ifndef _WIN32
-#include <unistd.h>
-#endif
 #endif
 
 extern void tetris(void);
@@ -99,4 +96,4 @@ void main (void)
 {
     app_main ();
 }
-#endif
\ No newline at end of file
+#endif
diff --git a/uisimulator/tetris.c b/uisimulator/tetris.c
index f85074a541..53dace345d 100644
--- a/uisimulator/tetris.c
+++ b/uisimulator/tetris.c
@@ -26,9 +26,6 @@
 
 #ifdef SIMULATOR
 #include <stdio.h>
-#ifndef _WIN32
-#include <unistd.h>
-#endif
 #endif
 
 int start_x = 1;