diff --git a/src/fileiter.cpp b/src/fileiter.cpp
index 38c0d2c3..f788d1c4 100644
--- a/src/fileiter.cpp
+++ b/src/fileiter.cpp
@@ -19,6 +19,7 @@
 
 #define BOOST_REGEX_SOURCE
 
+#include <boost/config.hpp>
 #include <climits>
 #include <stdexcept>
 #include <string>
diff --git a/src/posix_api.cpp b/src/posix_api.cpp
index abafd8f2..e59c19ea 100644
--- a/src/posix_api.cpp
+++ b/src/posix_api.cpp
@@ -18,6 +18,7 @@
 
 #define BOOST_REGEX_SOURCE
 
+#include <boost/config.hpp>
 #include <cstdio>
 #include <boost/regex.hpp>
 #include <boost/cregex.hpp>
diff --git a/src/regex.cpp b/src/regex.cpp
index 27ac43cc..ea20a06b 100644
--- a/src/regex.cpp
+++ b/src/regex.cpp
@@ -19,6 +19,7 @@
 
 #define BOOST_REGEX_SOURCE
 
+#include <boost/config.hpp>
 #include <new>
 #include <boost/regex.hpp>
 #include <boost/throw_exception.hpp>
diff --git a/src/regex_raw_buffer.cpp b/src/regex_raw_buffer.cpp
index 7a8de803..84a2fd5d 100644
--- a/src/regex_raw_buffer.cpp
+++ b/src/regex_raw_buffer.cpp
@@ -18,6 +18,7 @@
 
 
 #define BOOST_REGEX_SOURCE
+#include <boost/config.hpp>
 #include <memory>
 #include <cstring>
 #include <boost/assert.hpp>