diff --git a/src/add-ons/kernel/bus_managers/usb/Transfer.cpp b/src/add-ons/kernel/bus_managers/usb/Transfer.cpp
index 2b90dfb61c..ad3e3c66aa 100644
--- a/src/add-ons/kernel/bus_managers/usb/Transfer.cpp
+++ b/src/add-ons/kernel/bus_managers/usb/Transfer.cpp
@@ -92,21 +92,27 @@ Transfer::SetVector(iovec *vector, size_t vectorCount)
 	memcpy(fVector, vector, vectorCount * sizeof(iovec));
 	fVectorCount = vectorCount;
 	fBaseAddress = fVector[0].iov_base;
+
+	size_t length = 0;
+	for (size_t i = 0; i < fVectorCount && length < USB_MAX_FRAGMENT_SIZE; i++)
+		length += fVector[i].iov_len;
+
+	if (length > USB_MAX_FRAGMENT_SIZE) {
+		// the data is too large and would overflow the allocator
+		fFragmented = true;
+	}
 }
 
 
 size_t
-Transfer::VectorLength()
+Transfer::FragmentLength() const
 {
 	size_t length = 0;
 	for (size_t i = 0; i < fVectorCount; i++)
 		length += fVector[i].iov_len;
 
-	// the data is to large and would overflow the allocator
-	if (length > USB_MAX_FRAGMENT_SIZE) {
+	if (length > USB_MAX_FRAGMENT_SIZE)
 		length = USB_MAX_FRAGMENT_SIZE;
-		fFragmented = true;
-	}
 
 	return length;
 }
diff --git a/src/add-ons/kernel/bus_managers/usb/usb_private.h b/src/add-ons/kernel/bus_managers/usb/usb_private.h
index ebe592f1e8..e129393892 100644
--- a/src/add-ons/kernel/bus_managers/usb/usb_private.h
+++ b/src/add-ons/kernel/bus_managers/usb/usb_private.h
@@ -702,12 +702,12 @@ public:
 										size_t vectorCount);
 		iovec *						Vector() { return fVector; }
 		size_t						VectorCount() const { return fVectorCount; }
-		size_t						VectorLength();
 
 		uint16						Bandwidth() const { return fBandwidth; }
 
 		bool						IsFragmented() const { return fFragmented; }
 		void						AdvanceByFragment(size_t actualLength);
+		size_t						FragmentLength() const;
 
 		status_t					InitKernelAccess();
 		status_t					PrepareKernelAccess();
diff --git a/src/add-ons/kernel/busses/usb/ehci.cpp b/src/add-ons/kernel/busses/usb/ehci.cpp
index c003bb267c..2be4281c2d 100644
--- a/src/add-ons/kernel/busses/usb/ehci.cpp
+++ b/src/add-ons/kernel/busses/usb/ehci.cpp
@@ -1889,7 +1889,7 @@ EHCI::FinishTransfers()
 					if (transfer->transfer->IsFragmented()) {
 						// this transfer may still have data left
 						transfer->transfer->AdvanceByFragment(actualLength);
-						if (transfer->transfer->VectorLength() > 0) {
+						if (transfer->transfer->FragmentLength() > 0) {
 							FreeDescriptorChain(transfer->data_descriptor);
 							status_t result = FillQueueWithData(
 								transfer->transfer,
@@ -2319,7 +2319,7 @@ EHCI::FillQueueWithRequest(Transfer *transfer, ehci_qh *queueHead,
 	if (transfer->VectorCount() > 0) {
 		ehci_qtd *lastDescriptor = NULL;
 		status_t result = CreateDescriptorChain(pipe, &dataDescriptor,
-			&lastDescriptor, statusDescriptor, transfer->VectorLength(),
+			&lastDescriptor, statusDescriptor, transfer->FragmentLength(),
 			directionIn ? EHCI_QTD_PID_IN : EHCI_QTD_PID_OUT);
 
 		if (result != B_OK) {
@@ -2363,7 +2363,7 @@ EHCI::FillQueueWithData(Transfer *transfer, ehci_qh *queueHead,
 	ehci_qtd *lastDescriptor = NULL;
 	ehci_qtd *strayDescriptor = queueHead->stray_log;
 	status_t result = CreateDescriptorChain(pipe, &firstDescriptor,
-		&lastDescriptor, strayDescriptor, transfer->VectorLength(),
+		&lastDescriptor, strayDescriptor, transfer->FragmentLength(),
 		directionIn ? EHCI_QTD_PID_IN : EHCI_QTD_PID_OUT);
 
 	if (result != B_OK)
diff --git a/src/add-ons/kernel/busses/usb/ohci.cpp b/src/add-ons/kernel/busses/usb/ohci.cpp
index d10cb99fa6..d4df19f559 100644
--- a/src/add-ons/kernel/busses/usb/ohci.cpp
+++ b/src/add-ons/kernel/busses/usb/ohci.cpp
@@ -1164,9 +1164,9 @@ OHCI::_FinishTransfers()
 						// this transfer may still have data left
 						TRACE("advancing fragmented transfer\n");
 						transfer->transfer->AdvanceByFragment(actualLength);
-						if (transfer->transfer->VectorLength() > 0) {
+						if (transfer->transfer->FragmentLength() > 0) {
 							TRACE("still %ld bytes left on transfer\n",
-								transfer->transfer->VectorLength());
+								transfer->transfer->FragmentLength());
 							// TODO actually resubmit the transfer
 						}
 
@@ -1374,7 +1374,7 @@ OHCI::_SubmitRequest(Transfer *transfer)
 		ohci_general_td *lastDescriptor = NULL;
 		result = _CreateDescriptorChain(&dataDescriptor, &lastDescriptor,
 			directionIn ? OHCI_TD_DIRECTION_PID_IN : OHCI_TD_DIRECTION_PID_OUT,
-			transfer->VectorLength());
+			transfer->FragmentLength());
 		if (result < B_OK) {
 			_FreeGeneralDescriptor(setupDescriptor);
 			_FreeGeneralDescriptor(statusDescriptor);
@@ -1426,7 +1426,7 @@ OHCI::_SubmitTransfer(Transfer *transfer)
 	ohci_general_td *lastDescriptor = NULL;
 	status_t result = _CreateDescriptorChain(&firstDescriptor, &lastDescriptor,
 		directionIn ? OHCI_TD_DIRECTION_PID_IN : OHCI_TD_DIRECTION_PID_OUT,
-		transfer->VectorLength());
+		transfer->FragmentLength());
 
 	if (result < B_OK)
 		return result;
@@ -2022,7 +2022,7 @@ OHCI::_CreateIsochronousDescriptorChain(ohci_isochronous_td **_firstDescriptor,
 	Pipe *pipe = transfer->TransferPipe();
 	usb_isochronous_data *isochronousData = transfer->IsochronousData();
 
-	size_t dataLength = transfer->VectorLength();
+	size_t dataLength = transfer->FragmentLength();
 	size_t packet_count = isochronousData->packet_count;
 
 	if (packet_count == 0) {
diff --git a/src/add-ons/kernel/busses/usb/uhci.cpp b/src/add-ons/kernel/busses/usb/uhci.cpp
index 95fa32a4d2..644f949a61 100644
--- a/src/add-ons/kernel/busses/usb/uhci.cpp
+++ b/src/add-ons/kernel/busses/usb/uhci.cpp
@@ -992,7 +992,7 @@ UHCI::SubmitRequest(Transfer *transfer)
 		uhci_td *lastDescriptor = NULL;
 		status_t result = CreateDescriptorChain(pipe, &dataDescriptor,
 			&lastDescriptor, directionIn ? TD_TOKEN_IN : TD_TOKEN_OUT,
-			transfer->VectorLength());
+			transfer->FragmentLength());
 
 		if (result < B_OK) {
 			FreeDescriptor(setupDescriptor);
@@ -1504,9 +1504,9 @@ UHCI::FinishTransfers()
 						// this transfer may still have data left
 						TRACE("advancing fragmented transfer\n");
 						transfer->transfer->AdvanceByFragment(actualLength);
-						if (transfer->transfer->VectorLength() > 0) {
+						if (transfer->transfer->FragmentLength() > 0) {
 							TRACE("still %ld bytes left on transfer\n",
-								transfer->transfer->VectorLength());
+								transfer->transfer->FragmentLength());
 
 							Transfer *resubmit = transfer->transfer;
 
@@ -1962,7 +1962,7 @@ UHCI::CreateFilledTransfer(Transfer *transfer, uhci_td **_firstDescriptor,
 	uhci_td *lastDescriptor = NULL;
 	status_t result = CreateDescriptorChain(pipe, &firstDescriptor,
 		&lastDescriptor, directionIn ? TD_TOKEN_IN : TD_TOKEN_OUT,
-		transfer->VectorLength());
+		transfer->FragmentLength());
 
 	if (result < B_OK)
 		return result;