diff --git a/doc_src/open.txt b/doc_src/open.txt
index c81c3c9a1..7207fc172 100644
--- a/doc_src/open.txt
+++ b/doc_src/open.txt
@@ -9,6 +9,8 @@ open FILES...
 
 `open` opens a file in its default application, using the appropriate tool for the operating system. On GNU/Linux, this requires the common but optional `xdg-open` utility, from the `xdg-utils` package.
 
+Note that this function will not be used if a command by this name exists (which is the case on macOS or Haiku).
+
 
 \subsection open-example Example
 
diff --git a/share/functions/open.fish b/share/functions/open.fish
index 533b3df19..9eaa7eda6 100644
--- a/share/functions/open.fish
+++ b/share/functions/open.fish
@@ -3,7 +3,7 @@
 # application for the file.
 #
 
-if not test (uname) = Darwin
+if not command -s open >/dev/null
 	function open --description "Open file in default application"
 		if count $argv >/dev/null
 			switch $argv[1]