diff --git a/share/completions/chgrp.fish b/share/completions/chgrp.fish
index 309f465e0..b2622c442 100644
--- a/share/completions/chgrp.fish
+++ b/share/completions/chgrp.fish
@@ -1,12 +1,24 @@
-
-complete -c chgrp -s c -l changes -d "Output diagnostic for changed files"
-complete -c chgrp -l dereference -d "Dereference symbolic links"
-complete -c chgrp -s h -l no-dereference -d "Do not dereference symbolic links"
-complete -c chgrp -l from -d "Change from owner/group"
-complete -c chgrp -s f -l silent -d "Suppress errors"
-complete -c chgrp -l reference -d "Use same owner/group as file" -r
-complete -c chgrp -s R -l recursive -d "Operate recursively"
-complete -c chgrp -s v -l verbose -d "Output diagnostic for every file"
-complete -c chgrp -s h -l help -d "Display help and exit"
-complete -c chgrp -l version -d "Display version and exit"
-complete -c chgrp -d Group -a "(__fish_complete_groups)"
+if chgrp --version 2>/dev/null # not unix
+	complete -c chgrp -s c -l changes -d "Output diagnostic for changed files"
+	complete -c chgrp -l dereference -d "Dereference symlinks"
+	complete -c chgrp -s h -l no-dereference -d "Don't dereference symlinks"
+	complete -c chgrp -l from -d "Change from owner/group"
+	complete -c chgrp -s f -l silent -d "Suppress errors"
+	complete -c chgrp -l reference -d "Use same owner/group as file" -r
+	complete -c chgrp -s R -l recursive -d "Operate recursively"
+	complete -c chgrp -s v -l verbose -d "Output diagnostic for every file"
+	complete -c chgrp -l help -d "Display help and exit"
+	complete -c chgrp -l version -d "Display version and exit"
+	complete -c chgrp -d Group -a "(__fish_complete_groups)"
+else # not Linux
+	complete -c chgrp -s h -d "Don't dereference symlinks"
+	complete -c chgrp -s H -d "Follow specified symlinks with -R"
+	complete -c chgrp -s L -d "Follow all symlinks with -R"
+	complete -c chgrp -s P -d "Follow no symlinks with -R"
+	complete -c chgrp -s f -d "Suppress errors"
+	complete -c chgrp -s n -d "id is numeric; avoid lookup"
+	complete -c chgrp -s R -d "Operate recursively"
+	complete -c chgrp -s v -d "Output filenames"
+	complete -c chgrp -s x -d "Don'1t traverse fs mount points"
+	complete -c chgrp -d Group -a "(__fish_complete_groups)"
+end
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