diff --git a/conf.d/key_bindings.fish b/conf.d/key_bindings.fish
index 588e073..e6143ab 100644
--- a/conf.d/key_bindings.fish
+++ b/conf.d/key_bindings.fish
@@ -47,6 +47,10 @@
 # This allows for rapid-fire math without leaving the current shell.
 # ──────────────────────────────────────────────────────────────────────
 
+# Defines only fish_user_key_bindings, which fish calls from the interactive
+# reader and nowhere else.
+status is-interactive; or return
+
 function fish_user_key_bindings
 
     # Custom key chords are opinionated (C3 overrides); skip them entirely