diff --git a/cranelift/codegen/src/ir/instructions.rs b/cranelift/codegen/src/ir/instructions.rs
index 085f203639..e90488d229 100644
--- a/cranelift/codegen/src/ir/instructions.rs
+++ b/cranelift/codegen/src/ir/instructions.rs
@@ -933,6 +933,7 @@ mod tests {
         assert!(cmp.requires_typevar_operand());
         assert_eq!(cmp.num_fixed_results(), 1);
         assert_eq!(cmp.num_fixed_value_arguments(), 2);
+        assert_eq!(cmp.result_type(0, types::I64), types::I8);
     }
 
     #[test]