diff --git a/src/asm.rs b/src/asm.rs
index a1d22715731..8c5415172ce 100644
--- a/src/asm.rs
+++ b/src/asm.rs
@@ -697,6 +697,7 @@ fn explicit_reg_to_gcc(reg: InlineAsmReg) -> &'static str {
         }
         InlineAsmReg::Arm(reg) => reg.name(),
         InlineAsmReg::AArch64(reg) => reg.name(),
+        InlineAsmReg::M68k(reg) => reg.name(),
         _ => unimplemented!(),
     }
 }