diff --git a/README.md b/README.md
index 47328a3e..79b96362 100644
--- a/README.md
+++ b/README.md
@@ -272,7 +272,7 @@ require("oil").setup({
     -- Whether the preview window is automatically updated when the cursor is moved
     update_on_cursor_moved = true,
     -- Maximum file size in megabytes to preview
-    max_file_size = 100,
+    max_file_size_mb = 100,
   },
   -- Configuration for the floating action confirmation window
   confirmation = {
diff --git a/doc/oil.txt b/doc/oil.txt
index f0f81d92..32830365 100644
--- a/doc/oil.txt
+++ b/doc/oil.txt
@@ -157,7 +157,7 @@ CONFIG                                                                *oil-confi
         -- Whether the preview window is automatically updated when the cursor is moved
         update_on_cursor_moved = true,
         -- Maximum file size in megabytes to preview
-        max_file_size = 100,
+        max_file_size_mb = 100,
       },
       -- Configuration for the floating action confirmation window
       confirmation = {
diff --git a/lua/oil/config.lua b/lua/oil/config.lua
index 76a45d7c..4d7cf489 100644
--- a/lua/oil/config.lua
+++ b/lua/oil/config.lua
@@ -142,7 +142,7 @@ local default_config = {
     -- Whether the preview window is automatically updated when the cursor is moved
     update_on_cursor_moved = true,
     -- Maximum file size in megabytes to preview
-    max_file_size = 100,
+    max_file_size_mb = 100,
   },
   -- Configuration for the floating action confirmation window
   confirmation = {
@@ -330,7 +330,7 @@ local M = {}
 
 ---@class (exact) oil.SetupPreviewWindowConfig
 ---@field update_on_cursor_moved? boolean Whether the preview window is automatically updated when the cursor is moved
----@field max_file_size? number Maximum file size in megabytes to preview
+---@field max_file_size_mb? number Maximum file size in megabytes to preview
 
 ---@class (exact) oil.SetupConfirmationWindowConfig : oil.SetupWindowConfig
 
diff --git a/lua/oil/init.lua b/lua/oil/init.lua
index c04c81c5..ab050114 100644
--- a/lua/oil/init.lua
+++ b/lua/oil/init.lua
@@ -453,8 +453,8 @@ M.open_preview = function(opts, callback)
     return finish("Could not find entry under cursor")
   end
   if entry.meta ~= nil or entry.meta.stat ~= nil then
-    if entry.meta.stat.size >= config.preview.max_file_size * 1e6 then
-      return finish("File over " .. config.preview.max_file_size .. "MB is too large to preview ")
+    if entry.meta.stat.size >= config.preview.max_file_size_mb * 1e6 then
+      return finish("File over " .. config.preview.max_file_size_mb .. "MB is too large to preview ")
     end
   end
   local entry_title = entry.name