diff --git a/cranelift/codegen/src/isa/aarch64/lower.rs b/cranelift/codegen/src/isa/aarch64/lower.rs
index 07a8e896e6..4bb3c547e3 100644
--- a/cranelift/codegen/src/isa/aarch64/lower.rs
+++ b/cranelift/codegen/src/isa/aarch64/lower.rs
@@ -1515,6 +1515,8 @@ fn lower_insn_to_regs<C: LowerCtx<I = Inst>>(ctx: &mut C, insn: IRInst) {
             panic!("table_addr should have been removed by legalization!");
         }
 
+        Opcode::ConstAddr => unimplemented!(),
+
         Opcode::Nop => {
             // Nothing.
         }