diff --git a/compiler/stable_mir/src/mir/body.rs b/compiler/stable_mir/src/mir/body.rs
index 8081def1479..d86d56b3dc7 100644
--- a/compiler/stable_mir/src/mir/body.rs
+++ b/compiler/stable_mir/src/mir/body.rs
@@ -40,7 +40,7 @@ pub fn ret_local(&self) -> &LocalDecl {
 
     /// Locals in `self` that correspond to this function's arguments.
     pub fn arg_locals(&self) -> &[LocalDecl] {
-        &self.locals[1..self.arg_count + 1]
+        &self.locals[1..][..self.arg_count]
     }
 
     /// Inner locals for this function. These are the locals that are