diff --git a/fish_prompt.fish b/fish_prompt.fish
index 7033587..42071d1 100644
--- a/fish_prompt.fish
+++ b/fish_prompt.fish
@@ -781,7 +781,7 @@ function __bobthefish_prompt_rubies -S -d 'Display current Ruby information'
         or return
 
         # If asdf changes their ruby version provenance format, update this to match
-        [ "$asdf_provenance" = "(set by $HOME/.tool-versions)" ]
+        [ (string trim -- "$asdf_provenance") = "(set by $HOME/.tool-versions)" ]
         and return
 
         set ruby_version $asdf_ruby_version