diff --git a/tools/widl/client.c b/tools/widl/client.c
index 2b102c87827..7747f114cfb 100644
--- a/tools/widl/client.c
+++ b/tools/widl/client.c
@@ -23,7 +23,9 @@
  
 #include <stdio.h>
 #include <stdlib.h>
-#include <unistd.h>
+#ifdef HAVE_UNISTD_H
+# include <unistd.h>
+#endif
 #include <string.h>
 #include <ctype.h>
 
diff --git a/tools/widl/typelib.c b/tools/widl/typelib.c
index 1a5659981f1..100ae89e55b 100644
--- a/tools/widl/typelib.c
+++ b/tools/widl/typelib.c
@@ -26,7 +26,9 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <stdarg.h>
-#include <unistd.h>
+#ifdef HAVE_UNISTD_H
+# include <unistd.h>
+#endif
 #include <string.h>
 #include <ctype.h>