diff --git a/base/file.jl b/base/file.jl
index ba50a9deb3335..866e82b6e39c2 100644
--- a/base/file.jl
+++ b/base/file.jl
@@ -105,7 +105,7 @@ if Sys.iswindows()
     end
 else
     function cd(f::Function, dir::AbstractString)
-        fd = ccall(:open, Int32, (Cstring, Int32), :., 0)
+        fd = ccall(:open, Int32, (Cstring, Int32, UInt32...), :., 0)
         systemerror(:open, fd == -1)
         try
             cd(dir)
diff --git a/test/file.jl b/test/file.jl
index 7ca49fe3a065b..8544ae980af6b 100644
--- a/test/file.jl
+++ b/test/file.jl
@@ -1253,7 +1253,7 @@ let f = open(file, "w")
     if Sys.iswindows()
         f = RawFD(ccall(:_open, Cint, (Cstring, Cint), file, Base.Filesystem.JL_O_RDONLY))
     else
-        f = RawFD(ccall(:open, Cint, (Cstring, Cint), file, Base.Filesystem.JL_O_RDONLY))
+        f = RawFD(ccall(:open, Cint, (Cstring, Cint, UInt32...), file, Base.Filesystem.JL_O_RDONLY))
     end
     test_LibcFILE(Libc.FILE(f, Libc.modestr(true, false)))
 end
diff --git a/test/testhelpers/FakePTYs.jl b/test/testhelpers/FakePTYs.jl
index 17dd270cd2424..c592699440ee0 100644
--- a/test/testhelpers/FakePTYs.jl
+++ b/test/testhelpers/FakePTYs.jl
@@ -39,7 +39,7 @@ function open_fake_pty()
         rc = ccall(:unlockpt, Cint, (Cint,), fdm)
         rc != 0 && error("unlockpt")
 
-        fds = ccall(:open, Cint, (Ptr{UInt8}, Cint),
+        fds = ccall(:open, Cint, (Ptr{UInt8}, Cint, UInt32...),
             ccall(:ptsname, Ptr{UInt8}, (Cint,), fdm), O_RDWR | O_NOCTTY)
         pts = RawFD(fds)