diff --git a/libs/ardour/import.cc b/libs/ardour/import.cc
index cd3ab08f7f..ea4a761a5d 100644
--- a/libs/ardour/import.cc
+++ b/libs/ardour/import.cc
@@ -29,7 +29,9 @@
 #include <string>
 #include <climits>
 #include <cerrno>
+#ifdef HAVE_UNISTD_H
 #include <unistd.h>
+#endif
 #include <sys/stat.h>
 #include <time.h>
 #include <stdint.h>