diff --git a/src/add-ons/kernel/busses/usb/xhci.cpp b/src/add-ons/kernel/busses/usb/xhci.cpp
index 9d5e590d19..eedcf7b2b4 100644
--- a/src/add-ons/kernel/busses/usb/xhci.cpp
+++ b/src/add-ons/kernel/busses/usb/xhci.cpp
@@ -425,7 +425,8 @@ XHCI::Start()
 	uint32 params2 = ReadCapReg32(XHCI_HCSPARAMS2);
 	fScratchpadCount = HCS_MAX_SC_BUFFERS(params2);
 	if (fScratchpadCount > XHCI_MAX_SCRATCHPADS) {
-		TRACE_ERROR("Invalid number of scratchpads: %u\n", fScratchpadCount);
+		TRACE_ERROR("Invalid number of scratchpads: %" B_PRIu32 "\n",
+			fScratchpadCount);
 		return B_ERROR;
 	}
 
diff --git a/src/add-ons/kernel/busses/usb/xhci.h b/src/add-ons/kernel/busses/usb/xhci.h
index fc2d028e19..3657c0cb8d 100644
--- a/src/add-ons/kernel/busses/usb/xhci.h
+++ b/src/add-ons/kernel/busses/usb/xhci.h
@@ -242,7 +242,7 @@ private:
 			uint8				fPortSlots[XHCI_MAX_PORTS];
 
 			// Scratchpad
-			uint8				fScratchpadCount;
+			uint32				fScratchpadCount;
 			area_id				fScratchpadArea[XHCI_MAX_SCRATCHPADS];
 			void *				fScratchpad[XHCI_MAX_SCRATCHPADS];