diff --git a/llvm/test/MC/RISCV/rv32i-aliases-invalid.s b/llvm/test/MC/RISCV/rv32i-aliases-invalid.s
index 4080d89..ce603ba 100644
--- a/llvm/test/MC/RISCV/rv32i-aliases-invalid.s
+++ b/llvm/test/MC/RISCV/rv32i-aliases-invalid.s
@@ -1,3 +1,4 @@
+# UNSUPPORTED: linux, windows
 # RUN: not llvm-mc %s -triple=riscv32 -riscv-no-aliases 2>&1 | FileCheck %s
 # RUN: not llvm-mc %s -triple=riscv32 2>&1 | FileCheck %s
 
diff --git a/llvm/test/MC/RISCV/rv64i-aliases-invalid.s b/llvm/test/MC/RISCV/rv64i-aliases-invalid.s
index f3f2acc..3e156b39 100644
--- a/llvm/test/MC/RISCV/rv64i-aliases-invalid.s
+++ b/llvm/test/MC/RISCV/rv64i-aliases-invalid.s
@@ -1,3 +1,4 @@
+# UNSUPPORTED: linux, windows
 # RUN: not llvm-mc %s -triple=riscv64 -riscv-no-aliases 2>&1 | FileCheck %s
 # RUN: not llvm-mc %s -triple=riscv64 2>&1 | FileCheck %s