diff --git a/fish_completions.go b/fish_completions.go
index c942de963..a09938879 100644
--- a/fish_completions.go
+++ b/fish_completions.go
@@ -58,7 +58,7 @@ function __%[1]s_perform_completion
     # Let's ignore them or else it will break completion.
     # Ref: https://github.com/spf13/cobra/issues/1279
     for line in $results[-1..1]
-        if test (string trim $line) = ""
+        if test (string trim -- $line) = ""
             # Found an empty line, remove it
             set results $results[1..-2]
         else