diff --git a/src/hooks.rs b/src/hooks.rs
index 5840524..1184555 100644
--- a/src/hooks.rs
+++ b/src/hooks.rs
@@ -103,7 +103,7 @@ impl Hook {
                                             )
                                         })?,
                                     )?,
-                                    None => bail!("Missing expression in variable `{}`", token),
+                                    None => bail!("Invalid expression `{}`", token),
                                 };
 
                                 command.push_str(&replaced);