diff --git a/configure.ac b/configure.ac
index 6647cdc..c7c686c 100644
--- a/configure.ac
+++ b/configure.ac
@@ -95,6 +95,7 @@
 )
 
 AX_BOOST_SYSTEM
+AX_BOOST_FILESYSTEM
 AX_BOOST_UNIT_TEST_FRAMEWORK
 AM_CONDITIONAL(HAVE_BOOST_UNIT_TEST_FRAMEWORK, [test "x$ax_cv_boost_unit_test_framework" = "xyes"])