diff --git a/io_posix.cpp b/io_posix.cpp
index f4b612d0..c4d8683a 100644
--- a/io_posix.cpp
+++ b/io_posix.cpp
@@ -27,7 +27,9 @@ using util::detail::posix::mapped_file;
 
 
 //////////////////////////////////////////////////////////////////////////////
-mapped_file::mapped_file (const std::experimental::filesystem::path &path, int fflags, int mflags):
+mapped_file::mapped_file (const std::experimental::filesystem::path &path,
+                          int fflags,
+                          int mflags):
     mapped_file (util::posix::fd (path, fflags), mflags)
 { ; }
 
diff --git a/io_posix.hpp b/io_posix.hpp
index 0eae93eb..338f6b25 100644
--- a/io_posix.hpp
+++ b/io_posix.hpp
@@ -31,8 +31,11 @@ namespace util {
     namespace detail::posix {
         class mapped_file {
         public:
-            mapped_file (const std::experimental::filesystem::path&, int fflags = O_RDONLY | O_BINARY, int mflags = PROT_READ);
-            mapped_file (const util::posix::fd&,  int mflags = PROT_READ);
+            mapped_file (const std::experimental::filesystem::path&,
+                         int fflags = O_RDONLY | O_BINARY,
+                         int mflags = PROT_READ);
+            mapped_file (const util::posix::fd&,
+                         int mflags = PROT_READ);
 
             mapped_file (const mapped_file&) = delete;
             mapped_file& operator= (const mapped_file&) = delete;