diff --git a/llvm/lib/Target/RISCV/AsmParser/RISCVAsmParser.cpp b/llvm/lib/Target/RISCV/AsmParser/RISCVAsmParser.cpp
--- a/llvm/lib/Target/RISCV/AsmParser/RISCVAsmParser.cpp
+++ b/llvm/lib/Target/RISCV/AsmParser/RISCVAsmParser.cpp
@@ -1613,9 +1613,11 @@
     return MatchOperand_Success;
   case AsmToken::Plus:
     Opcode = MCBinaryExpr::Add;
+    getLexer().Lex();
     break;
   case AsmToken::Minus:
     Opcode = MCBinaryExpr::Sub;
+    getLexer().Lex();
     break;
   }
 
diff --git a/llvm/test/MC/RISCV/rvi-pseudos.s b/llvm/test/MC/RISCV/rvi-pseudos.s
--- a/llvm/test/MC/RISCV/rvi-pseudos.s
+++ b/llvm/test/MC/RISCV/rvi-pseudos.s
@@ -187,3 +187,9 @@
 # CHECK: auipc a5, %pcrel_hi((255+a_symbol)-4)
 # CHECK: addi  a5, a5, %pcrel_lo(.Lpcrel_hi30)
 lla a5, (0xFF + a_symbol) - 4
+
+## Check that we don't double-parse a top-level minus.
+# CHECK: .Lpcrel_hi31:
+# CHECK: auipc a5, %pcrel_hi(a_symbol-4)
+# CHECK: addi  a5, a5, %pcrel_lo(.Lpcrel_hi31)
+lla a5, a_symbol - 4