diff --git a/test/MC/Disassembler/X86/invalid-VEX-vvvv.txt b/test/MC/Disassembler/X86/invalid-VEX-vvvv.txt
new file mode 100644
index 00000000000..9feb54c517e
--- /dev/null
+++ b/test/MC/Disassembler/X86/invalid-VEX-vvvv.txt
@@ -0,0 +1,4 @@
+# RUN: llvm-mc --disassemble %s -triple=x86_64-apple-darwin9 |& grep {invalid instruction encoding}
+
+# This instruction would decode as movmskps if the vvvv field in the VEX prefix was all 1s.
+0xc5 0xf0 0x50 0xc0