diff --git a/share/functions/__fish_print_commands.fish b/share/functions/__fish_print_commands.fish
index 986a4f088..b9b05b907 100644
--- a/share/functions/__fish_print_commands.fish
+++ b/share/functions/__fish_print_commands.fish
@@ -1,5 +1,5 @@
 function __fish_print_commands --description "Print a list of documented fish commands"
-    if test -d $__fish_data_dir/man/man1/
+    if set -q __fish_data_dir[1] && test -d $__fish_data_dir/man/man1/
         for file in $__fish_data_dir/man/man1/**.1*
             string replace -r '.*/' '' -- $file |
                 string replace -r '.1(.gz)?$' '' |