diff --git a/llvm/lib/Target/AArch64/AArch64PointerAuth.cpp b/llvm/lib/Target/AArch64/AArch64PointerAuth.cpp
index f9b3027c35bb3..5d11f0d22574c 100644
--- a/llvm/lib/Target/AArch64/AArch64PointerAuth.cpp
+++ b/llvm/lib/Target/AArch64/AArch64PointerAuth.cpp
@@ -231,6 +231,7 @@ MachineBasicBlock &llvm::AArch64PAuth::checkAuthenticatedRegister(
         .addMBB(BreakBlock);
     return *SuccessBlock;
   }
+  llvm_unreachable("Unknown AuthCheckMethod enum");
 }
 
 unsigned llvm::AArch64PAuth::getCheckerSizeInBytes(AuthCheckMethod Method) {
@@ -244,6 +245,7 @@ unsigned llvm::AArch64PAuth::getCheckerSizeInBytes(AuthCheckMethod Method) {
   case AuthCheckMethod::XPACHint:
     return 20;
   }
+  llvm_unreachable("Unknown AuthCheckMethod enum");
 }
 
 bool AArch64PointerAuth::checkAuthenticatedLR(