diff --git a/regress/pshufb.py b/regress/pshufb.py
new file mode 100755
index 00000000..0d01bf5e
--- /dev/null
+++ b/regress/pshufb.py
@@ -0,0 +1,12 @@
+#!/usr/bin/python
+# By Ryan Hileman, issue #91
+
+# Invalid instruction = test failed
+
+from unicorn import *
+from unicorn.x86_const import *
+uc = Uc(UC_ARCH_X86, UC_MODE_64)
+uc.mem_map(0x2000, 0x1000)
+# pshufb xmm0, xmm1
+uc.mem_write(0x2000, '660f3800c1'.decode('hex'))
+uc.emu_start(0x2000, 0)