diff --git a/llvm/lib/Target/AArch64/AArch64InstrInfo.h b/llvm/lib/Target/AArch64/AArch64InstrInfo.h
index 9a2914891675c..f434799c3982b 100644
--- a/llvm/lib/Target/AArch64/AArch64InstrInfo.h
+++ b/llvm/lib/Target/AArch64/AArch64InstrInfo.h
@@ -725,6 +725,7 @@ static inline unsigned getAUTOpcodeForKey(AArch64PACKey::ID K, bool Zero) {
   case DA: return Zero ? AArch64::AUTDZA : AArch64::AUTDA;
   case DB: return Zero ? AArch64::AUTDZB : AArch64::AUTDB;
   }
+  llvm_unreachable("Unhandled AArch64PACKey::ID enum");
 }
 
 /// Return PAC opcode to be used for a ptrauth sign using the given key, or its
@@ -737,6 +738,7 @@ static inline unsigned getPACOpcodeForKey(AArch64PACKey::ID K, bool Zero) {
   case DA: return Zero ? AArch64::PACDZA : AArch64::PACDA;
   case DB: return Zero ? AArch64::PACDZB : AArch64::PACDB;
   }
+  llvm_unreachable("Unhandled AArch64PACKey::ID enum");
 }
 
 // struct TSFlags {