diff --git a/unittests/ASM/REP/F3_2A.asm b/unittests/ASM/REP/F3_2A.asm
index 707574f45..f3b842597 100644
--- a/unittests/ASM/REP/F3_2A.asm
+++ b/unittests/ASM/REP/F3_2A.asm
@@ -4,7 +4,9 @@
     "XMM0":  ["0x414243443f800000", "0x5152535455565758"],
     "XMM1":  ["0x4142434440000000", "0x5152535455565758"],
     "XMM2":  ["0x4142434440400000", "0x5152535455565758"],
-    "XMM3":  ["0x4142434440800000", "0x5152535455565758"]
+    "XMM3":  ["0x4142434440800000", "0x5152535455565758"],
+    "XMM4":  ["0x41424344C0800000", "0x5152535455565758"],
+    "XMM5":  ["0x41424344C0800000", "0x5152535455565758"]
   },
   "MemoryRegions": {
     "0x100000000": "4096"
@@ -28,10 +30,16 @@ mov [rdx + 8 * 4], rax
 mov rax, 0x4
 mov [rdx + 8 * 5], rax
 
+; Stick something in the top 32bits to ensure correctness
+mov rax, 0x7fc00000FFFFFFFC
+mov [rdx + 8 * 6], rax
+
 movapd xmm0, [rdx + 8 * 0]
 movapd xmm1, [rdx + 8 * 0]
 movapd xmm2, [rdx + 8 * 0]
 movapd xmm3, [rdx + 8 * 0]
+movapd xmm4, [rdx + 8 * 0]
+movapd xmm5, [rdx + 8 * 0]
 
 mov rax, [rdx + 8 * 2]
 mov rbx, [rdx + 8 * 3]
@@ -42,4 +50,9 @@ cvtsi2ss xmm1, ebx
 cvtsi2ss xmm2, dword [rdx + 8 * 4]
 cvtsi2ss xmm3, qword [rdx + 8 * 5]
 
+mov rbx, [rdx + 8 * 6]
+
+cvtsi2ss xmm4, ebx
+cvtsi2ss xmm5, dword [rdx + 8 * 6]
+
 hlt