diff --git a/libs/ardour/location.cc b/libs/ardour/location.cc
index 95e1311268..88f3257db2 100644
--- a/libs/ardour/location.cc
+++ b/libs/ardour/location.cc
@@ -27,7 +27,9 @@
 #include <algorithm>
 #include <set>
 #include <cstdio> /* for sprintf */
+#ifdef HAVE_UNISTD_H
 #include <unistd.h>
+#endif
 #include <cerrno>
 #include <ctime>
 #include <list>