diff --git a/test/MC/ARM/thumb-nop.s b/test/MC/ARM/thumb-nop.s
new file mode 100644
index 0000000..0b580ea
--- /dev/null
+++ b/test/MC/ARM/thumb-nop.s
@@ -0,0 +1,9 @@
+@ RUN: llvm-mc -triple=thumbv6-apple-darwin -show-encoding < %s | FileCheck %s -check-prefix=CHECK-V6
+@ RUN: llvm-mc -triple=thumbv7-apple-darwin -show-encoding < %s | FileCheck %s -check-prefix=CHECK-V7
+
+  .syntax unified
+
+        nop
+
+@ CHECK-V6: nop                            @ encoding: [0xc0,0x46]
+@ CHECK-V7: nop                            @ encoding: [0x00,0xbf]