diff --git a/aegisub/libaegisub/unix/fs.cpp b/aegisub/libaegisub/unix/fs.cpp
index 6c59766a2..7f1432d10 100644
--- a/aegisub/libaegisub/unix/fs.cpp
+++ b/aegisub/libaegisub/unix/fs.cpp
@@ -23,6 +23,7 @@
 #include <boost/filesystem.hpp>
 #include <fcntl.h>
 #include <fnmatch.h>
+#include <fstream>
 #include <sys/time.h>
 
 namespace bfs = boost::filesystem;