diff --git a/src/add-ons/kernel/busses/usb/ehci.cpp b/src/add-ons/kernel/busses/usb/ehci.cpp
index 80d0315f4b..261cb0cb68 100644
--- a/src/add-ons/kernel/busses/usb/ehci.cpp
+++ b/src/add-ons/kernel/busses/usb/ehci.cpp
@@ -2039,9 +2039,6 @@ EHCI::LinkQueueHead(ehci_qh *queueHead)
 status_t
 EHCI::LinkInterruptQueueHead(ehci_qh *queueHead, Pipe *pipe)
 {
-	if (!Lock())
-		return B_ERROR;
-
 	uint8 interval = pipe->Interval();
 	if (pipe->Speed() == USB_SPEED_HIGHSPEED) {
 		// Allow interrupts to be scheduled on each possible micro frame.
@@ -2070,6 +2067,9 @@ EHCI::LinkInterruptQueueHead(ehci_qh *queueHead, Pipe *pipe)
 	if (interval > EHCI_INTERRUPT_ENTRIES_COUNT)
 		interval = EHCI_INTERRUPT_ENTRIES_COUNT;
 
+	if (!Lock())
+		return B_ERROR;
+
 	ehci_qh *interruptQueue = &fInterruptEntries[interval - 1].queue_head;
 	queueHead->next_phy = interruptQueue->next_phy;
 	queueHead->next_log = interruptQueue->next_log;