diff --git a/Source/Core/Core/IOS/Device.cpp b/Source/Core/Core/IOS/Device.cpp
index c5da4c662c..467ce5cfd1 100644
--- a/Source/Core/Core/IOS/Device.cpp
+++ b/Source/Core/Core/IOS/Device.cpp
@@ -7,6 +7,7 @@
 #include <algorithm>
 #include <map>
 
+#include "Common/Assert.h"
 #include "Common/Logging/Log.h"
 #include "Common/StringUtil.h"
 #include "Core/HW/Memmap.h"
@@ -77,6 +78,14 @@ IOCtlVRequest::IOCtlVRequest(const u32 address_) : Request(address_)
   }
 }
 
+const IOCtlVRequest::IOVector* IOCtlVRequest::GetVector(size_t index) const
+{
+  _assert_(index < (in_vectors.size() + io_vectors.size()));
+  if (index < in_vectors.size())
+    return &in_vectors[index];
+  return &io_vectors[index - in_vectors.size()];
+}
+
 bool IOCtlVRequest::HasNumberOfValidVectors(const size_t in_count, const size_t io_count) const
 {
   if (in_vectors.size() != in_count || io_vectors.size() != io_count)
diff --git a/Source/Core/Core/IOS/Device.h b/Source/Core/Core/IOS/Device.h
index e9191f163c..0723972be4 100644
--- a/Source/Core/Core/IOS/Device.h
+++ b/Source/Core/Core/IOS/Device.h
@@ -156,6 +156,7 @@ struct IOCtlVRequest final : Request
   // merging them into a single std::vector would make using the first out vector more complicated.
   std::vector<IOVector> in_vectors;
   std::vector<IOVector> io_vectors;
+  const IOVector* GetVector(size_t index) const;
   explicit IOCtlVRequest(u32 address);
   bool HasNumberOfValidVectors(size_t in_count, size_t io_count) const;
   void Dump(const std::string& description, LogTypes::LOG_TYPE type = LogTypes::IOS,
diff --git a/Source/Core/Core/IOS/USB/USBV5.cpp b/Source/Core/Core/IOS/USB/USBV5.cpp
index 804989b75a..424a3dc98f 100644
--- a/Source/Core/Core/IOS/USB/USBV5.cpp
+++ b/Source/Core/Core/IOS/USB/USBV5.cpp
@@ -7,7 +7,6 @@
 #include <algorithm>
 #include <cstddef>
 #include <cstring>
-#include <numeric>
 
 #include "Common/ChunkFile.h"
 #include "Common/Logging/Log.h"
@@ -22,38 +21,38 @@ namespace HLE
 namespace USB
 {
 V5CtrlMessage::V5CtrlMessage(Kernel& ios, const IOCtlVRequest& ioctlv)
-    : CtrlMessage(ios, ioctlv, Memory::Read_U32(ioctlv.in_vectors[0].address + 16))
+    : CtrlMessage(ios, ioctlv, ioctlv.GetVector(1)->address)
 {
   request_type = Memory::Read_U8(ioctlv.in_vectors[0].address + 8);
   request = Memory::Read_U8(ioctlv.in_vectors[0].address + 9);
   value = Memory::Read_U16(ioctlv.in_vectors[0].address + 10);
   index = Memory::Read_U16(ioctlv.in_vectors[0].address + 12);
-  length = Memory::Read_U16(ioctlv.in_vectors[0].address + 14);
+  length = static_cast<u16>(ioctlv.GetVector(1)->size);
 }
 
 V5BulkMessage::V5BulkMessage(Kernel& ios, const IOCtlVRequest& ioctlv)
-    : BulkMessage(ios, ioctlv, Memory::Read_U32(ioctlv.in_vectors[0].address + 8))
+    : BulkMessage(ios, ioctlv, ioctlv.GetVector(1)->address)
 {
-  length = Memory::Read_U16(ioctlv.in_vectors[0].address + 12);
+  length = static_cast<u16>(ioctlv.GetVector(1)->size);
   endpoint = Memory::Read_U8(ioctlv.in_vectors[0].address + 18);
 }
 
 V5IntrMessage::V5IntrMessage(Kernel& ios, const IOCtlVRequest& ioctlv)
-    : IntrMessage(ios, ioctlv, Memory::Read_U32(ioctlv.in_vectors[0].address + 8))
+    : IntrMessage(ios, ioctlv, ioctlv.GetVector(1)->address)
 {
-  length = Memory::Read_U16(ioctlv.in_vectors[0].address + 12);
+  length = static_cast<u16>(ioctlv.GetVector(1)->size);
   endpoint = Memory::Read_U8(ioctlv.in_vectors[0].address + 14);
 }
 
 V5IsoMessage::V5IsoMessage(Kernel& ios, const IOCtlVRequest& ioctlv)
-    : IsoMessage(ios, ioctlv, Memory::Read_U32(ioctlv.in_vectors[0].address + 8))
+    : IsoMessage(ios, ioctlv, ioctlv.GetVector(2)->address)
 {
   num_packets = Memory::Read_U8(ioctlv.in_vectors[0].address + 16);
   endpoint = Memory::Read_U8(ioctlv.in_vectors[0].address + 17);
-  packet_sizes_addr = Memory::Read_U32(ioctlv.in_vectors[0].address + 12);
+  packet_sizes_addr = ioctlv.GetVector(1)->address;
   for (size_t i = 0; i < num_packets; ++i)
     packet_sizes.push_back(Memory::Read_U16(static_cast<u32>(packet_sizes_addr + i * sizeof(u16))));
-  length = std::accumulate(packet_sizes.begin(), packet_sizes.end(), 0);
+  length = static_cast<u16>(ioctlv.GetVector(2)->size);
 }
 }  // namespace USB