diff --git a/src/xrt/compositor/main/comp_sync.c b/src/xrt/compositor/main/comp_sync.c
index c9a02ae29..2d852d5b4 100644
--- a/src/xrt/compositor/main/comp_sync.c
+++ b/src/xrt/compositor/main/comp_sync.c
@@ -18,7 +18,9 @@
 #include <stdio.h>
 #include <stdlib.h>
 
+#ifndef XRT_OS_WINDOWS
 #include <unistd.h>
+#endif