diff --git a/base/fs.jl b/base/fs.jl
index 1d387e60694ca..89acbaba2bdaf 100644
--- a/base/fs.jl
+++ b/base/fs.jl
@@ -33,6 +33,7 @@ export File,
        JL_O_SHORT_LIVED,
        JL_O_SEQUENTIAL,
        JL_O_RANDOM,
+       JL_O_NOCTTY,
        S_IRUSR, S_IWUSR, S_IXUSR, S_IRWXU,
        S_IRGRP, S_IWGRP, S_IXGRP, S_IRWXG,
        S_IROTH, S_IWOTH, S_IXOTH, S_IRWXO
diff --git a/src/file_constants.h b/src/file_constants.h
index 348a96d3b6768..97de44d9e3bf4 100644
--- a/src/file_constants.h
+++ b/src/file_constants.h
@@ -21,3 +21,6 @@ const JL_O_SEQUENTIAL   = O_SEQUENTIAL
 #ifdef O_RANDOM
 const JL_O_RANDOM       = O_RANDOM
 #endif
+#ifdef O_NOCTTY
+const JL_O_NOCTTY       = O_NOCTTY
+#endif
\ No newline at end of file
diff --git a/test/repl.jl b/test/repl.jl
index 58007995f8a23..3b263a2de763c 100644
--- a/test/repl.jl
+++ b/test/repl.jl
@@ -5,7 +5,7 @@ let exename=joinpath(JULIA_HOME,(ccall(:jl_is_debugbuild,Cint,())==0?"julia":"ju
 @unix_only begin
 
 const O_RDWR = Base.FS.JL_O_RDWR
-const O_NOCTTY = 0x20000
+const O_NOCTTY = Base.FS.JL_O_NOCTTY
 
 fdm = ccall(:posix_openpt,Cint,(Cint,),O_RDWR|O_NOCTTY)
 fdm == -1 && error("Failed to open PTY master")