diff --git a/share/completions/uname.fish b/share/completions/uname.fish
index d1ea716a4..13029faf1 100644
--- a/share/completions/uname.fish
+++ b/share/completions/uname.fish
@@ -1,11 +1,21 @@
-complete -c uname -s a -l all --description "Print all information"
-complete -c uname -s s -l kernel-name --description "Print kernel name"
-complete -c uname -s n -l nodename --description "Print network node hostname"
-complete -c uname -s r -l kernel-release --description "Print kernel release"
-complete -c uname -s v -l kernel-version --description "Print kernel version"
-complete -c uname -s m -l machine --description "Print machine name"
-complete -c uname -s p -l processor --description "Print processor"
-complete -c uname -s i -l hardware-platform --description "Print hardware platform"
-complete -c uname -s o -l operating-system --description "Print operating system"
-complete -c uname -l help --description "Display help and exit"
-complete -c uname -l version --description "Display version and exit"
+if test (uname) = Darwin
+  complete -c uname -s a --description 'Behave as though all of the options mnrsv were specified.'
+  complete -c uname -s m --description 'print the machine hardware name.'
+  complete -c uname -s n --description 'print the nodename'
+  complete -c uname -s p --description 'print the machine processor architecture name.'
+  complete -c uname -s r --description 'print the operating system release.'
+  complete -c uname -s s --description 'print the operating system name.'
+  complete -c uname -s v --description 'print the operating system version.'
+else
+  complete -c uname -s a -l all --description "Print all information"
+  complete -c uname -s s -l kernel-name --description "Print kernel name"
+  complete -c uname -s n -l nodename --description "Print network node hostname"
+  complete -c uname -s r -l kernel-release --description "Print kernel release"
+  complete -c uname -s v -l kernel-version --description "Print kernel version"
+  complete -c uname -s m -l machine --description "Print machine name"
+  complete -c uname -s p -l processor --description "Print processor"
+  complete -c uname -s i -l hardware-platform --description "Print hardware platform"
+  complete -c uname -s o -l operating-system --description "Print operating system"
+  complete -c uname -l help --description "Display help and exit"
+  complete -c uname -l version --description "Display version and exit"
+end