diff --git a/llvm/test/MC/X86/avx512-err.s b/llvm/test/MC/X86/avx512-err.s
new file mode 100644
index 000000000000..bfe6e39ee31d
--- /dev/null
+++ b/llvm/test/MC/X86/avx512-err.s
@@ -0,0 +1,6 @@
+// RUN: not llvm-mc -triple x86_64-unknown-unknown -mcpu=knl -mattr=+avx512dq --show-encoding %s 2> %t.err
+// RUN: FileCheck --check-prefix=ERR < %t.err %s
+
+// ERR: invalid operand for instruction
+vpcmpd $1, %zmm24, %zmm7, %k5{%k0}
+