diff --git a/CHANGELOG.md b/CHANGELOG.md
index 0d963aa39452..b03e7b191432 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -39,6 +39,7 @@ Compatibility:
 * Implemented `Dir#each_child`.
 * Implemented `Kernel.{chomp, chop}` and `Kernel#{chomp, chop}`.
 * Implemented `-p` and `-a`, and `-l` CLI options.
+* Convert the argument to `File.realpath` with `#to_path` (#1894).
 
 Changes:
 
diff --git a/src/main/ruby/truffleruby/core/file.rb b/src/main/ruby/truffleruby/core/file.rb
index a8c763303336..1baad1084895 100644
--- a/src/main/ruby/truffleruby/core/file.rb
+++ b/src/main/ruby/truffleruby/core/file.rb
@@ -934,6 +934,8 @@ def self.readlink(path)
   end
 
   def self.realpath(path, basedir = nil)
+    path = Truffle::Type.coerce_to_path(path)
+
     unless absolute_path?(path)
       path = expand_path(path, basedir)
     end