Update to ruby/spec@b0b7f53

1 files changed, 5 insertions, 3 deletions

diff --git a/spec/ruby/core/process/exec_spec.rb b/spec/ruby/core/process/exec_spec.rb
index 0a2c2f77e7..deb8913b6b 100644
--- a/spec/ruby/core/process/exec_spec.rb
+++ b/spec/ruby/core/process/exec_spec.rb
@@ -193,9 +193,11 @@ describe "Process.exec" do
           map_fd_fixture = fixture __FILE__, "map_fd.rb"
           cmd = <<-EOC
             f = File.open(#{@name.inspect}, "w+")
-            child_fd = f.fileno + 1
-            File.open(#{@child_fd_file.inspect}, "w") { |io| io.print child_fd }
-            Process.exec "#{ruby_cmd(map_fd_fixture)} \#{child_fd}", { child_fd => f }
+            File.open(#{__FILE__.inspect}, "r") do |io|
+              child_fd = io.fileno
+              File.open(#{@child_fd_file.inspect}, "w") { |io| io.print child_fd }
+              Process.exec "#{ruby_cmd(map_fd_fixture)} \#{child_fd}", { child_fd => f }
+            end
             EOC
 
           ruby_exe(cmd, escape: true)