diff --git a/fish-rust/src/signal.rs b/fish-rust/src/signal.rs
index 365ac6de9..fd8607336 100644
--- a/fish-rust/src/signal.rs
+++ b/fish-rust/src/signal.rs
@@ -323,7 +323,7 @@ fn from(value: Signal) -> Self {
 
 impl From<Signal> for usize {
     fn from(value: Signal) -> Self {
-        value.code() as usize
+        usize::try_from(value.code()).unwrap()
     }
 }