diff --git a/Modules/timemodule.c b/Modules/timemodule.c
index 87e543f..23de173 100644
--- a/Modules/timemodule.c
+++ b/Modules/timemodule.c
@@ -19,7 +19,9 @@
 
 #include <ctype.h>
 
+#ifdef HAVE_SYS_TYPES_H
 #include <sys/types.h>
+#endif /* HAVE_SYS_TYPES_H */
 
 #ifdef QUICKWIN
 #include <io.h>