diff --git a/test/MC/X86/x86-64.s b/test/MC/X86/x86-64.s
index ee9757fa317..fe056be012e 100644
--- a/test/MC/X86/x86-64.s
+++ b/test/MC/X86/x86-64.s
@@ -973,3 +973,19 @@ xsetbv // CHECK: xsetbv # encoding: [0x0f,0x01,0xd1]
 // CHECK: loopne 0
 // CHECK: encoding: [0xe0,A]
 	loopnz 0
+
+// CHECK: strw
+// CHECK: encoding: [0x66,0x0f,0x00,0xc8]
+	str %ax
+
+// CHECK: strl
+// CHECK: encoding: [0x0f,0x00,0xc8]
+	str %eax
+
+// CHECK: strw
+// CHECK: encoding: [0x66,0x0f,0x00,0xc8]
+	str %ax
+
+// CHECK: strq
+// CHECK: encoding: [0x48,0x0f,0x00,0xc8]
+	str %rax