diff --git a/libs/pbd/pathexpand.cc b/libs/pbd/pathexpand.cc
index 3f1f1cf670..5784ec9428 100644
--- a/libs/pbd/pathexpand.cc
+++ b/libs/pbd/pathexpand.cc
@@ -23,7 +23,7 @@
 #include <cerrno>
 #include <cstdlib>
 
-#include <boost/regex.h>
+#include <regex.h>
 
 #include <glibmm/miscutils.h>