diff --git a/lib/reline/terminfo.rb b/lib/reline/terminfo.rb
index d78f3d7b17..3f32a5aab0 100644
--- a/lib/reline/terminfo.rb
+++ b/lib/reline/terminfo.rb
@@ -71,7 +71,7 @@ module Reline::Terminfo
   def self.setupterm(term, fildes)
     errret_int = String.new("\x00" * 8, encoding: 'ASCII-8BIT')
     ret = @setupterm.(term, fildes, errret_int)
-    errret = errret_int.unpack('i')[0]
+    errret = errret_int.unpack1('i')
     case ret
     when 0 # OK
       0
diff --git a/lib/reline/windows.rb b/lib/reline/windows.rb
index 642f33aedf..5bbf1e9d57 100644
--- a/lib/reline/windows.rb
+++ b/lib/reline/windows.rb
@@ -184,7 +184,7 @@ class Reline::Windows
     #     DWORD FileNameLength;
     #     WCHAR FileName[1];
     #   } FILE_NAME_INFO
-    len = p_buffer[0, 4].unpack("L")[0]
+    len = p_buffer[0, 4].unpack1("L")
     name = p_buffer[4, len].encode(Encoding::UTF_8, Encoding::UTF_16LE, invalid: :replace)
 
     # Check if this could be a MSYS2 pty pipe ('\msys-XXXX-ptyN-XX')