diff --git a/melior/src/ir/block.rs b/melior/src/ir/block.rs
index a902960f70..54ffbe1d68 100644
--- a/melior/src/ir/block.rs
+++ b/melior/src/ir/block.rs
@@ -143,7 +143,7 @@ impl<'c> Block<'c> {
     }
 }
 
-impl<'c, 'v> BlockApi<'c, 'v> for Block<'c> {
+impl<'c, 'v> BlockApi<'c, 'v> for &'v Block<'c> {
     fn argument(&self, index: usize) -> Result<BlockArgument<'c, 'v>, Error> {
         unsafe {
             if index < self.argument_count() {