diff -Nru imath-2.1.4/debian/bzr-builder.manifest imath-2.1.4/debian/bzr-builder.manifest
--- imath-2.1.4/debian/bzr-builder.manifest	2016-08-01 21:36:21.000000000 +0000
+++ imath-2.1.4/debian/bzr-builder.manifest	2016-08-02 21:31:46.000000000 +0000
@@ -1,2 +1,2 @@
-# bzr-builder format 0.3 deb-version {debupstream}-0~119
-lp:imath revid:git-v1:2cd26a3902b72d551543632d090a10af0238c205
+# bzr-builder format 0.3 deb-version {debupstream}-0~120
+lp:imath revid:git-v1:6e004c34903b97046678e17a988acc28f4e2d003
diff -Nru imath-2.1.4/debian/changelog imath-2.1.4/debian/changelog
--- imath-2.1.4/debian/changelog	2016-08-01 21:36:21.000000000 +0000
+++ imath-2.1.4/debian/changelog	2016-08-02 21:31:46.000000000 +0000
@@ -1,8 +1,8 @@
-imath (2.1.4-0~119~ubuntu12.04.1) precise; urgency=low
+imath (2.1.4-0~120~ubuntu12.04.1) precise; urgency=low
 
   * Auto build.
 
- -- Jan Rheinländer <jrheinlaender@users.sourceforge.net>  Mon, 01 Aug 2016 21:36:21 +0000
+ -- Jan Rheinländer <jrheinlaender@users.sourceforge.net>  Tue, 02 Aug 2016 21:31:46 +0000
 
 imath (2.1.4) experimental; urgency=low
   * Add option to suppress units when printing formulas
diff -Nru imath-2.1.4/src/smathlexer.lxx imath-2.1.4/src/smathlexer.lxx
--- imath-2.1.4/src/smathlexer.lxx	2016-08-01 21:36:21.000000000 +0000
+++ imath-2.1.4/src/smathlexer.lxx	2016-08-02 21:31:46.000000000 +0000
@@ -27,6 +27,7 @@
 // This can also be done by calling flex with --nounistd
 #ifdef _MSC_VER
   #define YY_NO_UNISTD_H
+  #include <codecvt>
 #endif
 
 /* Work around an incompatibility in flex (at least versions
@@ -945,7 +946,13 @@
 
 const bool smathlexer::begin_include(const std::string &fname) {
   YY_BUFFER_STATE new_buffer;
+#ifdef _MSC_VER
+  std::wstring_convert<std::codecvt_utf8_utf16<wchar_t>> converter;
+  std::wstring wfname = converter.from_bytes(fname);
+  FILE *yyin = _wfopen(wfname.c_str(), L"r");
+#else
   FILE *yyin = fopen(fname.c_str(), "r");
+#endif
 
   if (yyin == NULL) {
     return (false);