diff --git a/llvm/lib/Target/RISCV/RISCVInstrInfo.td b/llvm/lib/Target/RISCV/RISCVInstrInfo.td
--- a/llvm/lib/Target/RISCV/RISCVInstrInfo.td
+++ b/llvm/lib/Target/RISCV/RISCVInstrInfo.td
@@ -237,7 +237,7 @@
   let PredicateMethod = "isImm";
 }
 
-def uimm6 : Operand<XLenVT>, ImmLeaf<XLenVT, [{return isInt<6>(Imm);}]> {
+def uimm6 : Operand<XLenVT>, ImmLeaf<XLenVT, [{return isUInt<6>(Imm);}]> {
   let ParserMatchClass = UImmAsmOperand<6>;
   let DecoderMethod = "decodeUImmOperand<6>";
   let OperandType = "OPERAND_UIMM6";