diff --git a/io_win32.cpp b/io_win32.cpp
index c27e2410..521c2fdd 100644
--- a/io_win32.cpp
+++ b/io_win32.cpp
@@ -140,7 +140,7 @@ mapped_file::mapped_file (const std::experimental::filesystem::path &path,
 
 
 //-----------------------------------------------------------------------------
-mapped_file::mapped_file (const util::fd &src,
+mapped_file::mapped_file (const util::posix::fd &src,
                           int fflags,
                           int mflags):
     mapped_file (util::win32::handle (reinterpret_cast<HANDLE> (_get_osfhandle (src))),
diff --git a/io_win32.hpp b/io_win32.hpp
index 776eaedc..06197087 100644
--- a/io_win32.hpp
+++ b/io_win32.hpp
@@ -60,7 +60,7 @@ namespace util {
             mapped_file (const std::experimental::filesystem::path &path,
                          int fflags = O_RDONLY,
                          int mflags = PROT_READ);
-            mapped_file (const util::fd&,
+            mapped_file (const util::posix::fd&,
                          int fflag = O_RDONLY,
                          int mflags = PROT_READ);