diff --git a/llvm/lib/Target/AArch64/Disassembler/AArch64Disassembler.cpp b/llvm/lib/Target/AArch64/Disassembler/AArch64Disassembler.cpp
index 3170ad8c99774..e7820f7d6c5b1 100644
--- a/llvm/lib/Target/AArch64/Disassembler/AArch64Disassembler.cpp
+++ b/llvm/lib/Target/AArch64/Disassembler/AArch64Disassembler.cpp
@@ -38,9 +38,6 @@ using DecodeStatus = MCDisassembler::DecodeStatus;
 template <int Bits>
 static DecodeStatus DecodeSImm(MCInst &Inst, uint64_t Imm, uint64_t Address,
                                const MCDisassembler *Decoder);
-template <int Bits>
-static DecodeStatus DecodeUImm(MCInst &Inst, uint64_t Imm, uint64_t Address,
-                               const MCDisassembler *Decoder);
 
 #define Success MCDisassembler::Success
 #define Fail MCDisassembler::Fail
@@ -1444,16 +1441,6 @@ static DecodeStatus DecodeSImm(MCInst &Inst, uint64_t Imm, uint64_t Address,
   return Success;
 }
 
-template <int Bits>
-static DecodeStatus DecodeUImm(MCInst &Inst, uint64_t Imm, uint64_t Address,
-                               const MCDisassembler *Decoder) {
-  if (Imm & ~((1ULL << Bits) - 1))
-    return Fail;
-
-  Inst.addOperand(MCOperand::createImm(Imm));
-  return Success;
-}
-
 // Decode 8-bit signed/unsigned immediate for a given element width.
 template <int ElementWidth>
 static DecodeStatus DecodeImm8OptLsl(MCInst &Inst, unsigned Imm, uint64_t Addr,