diff --git a/src/add-ons/kernel/drivers/input/usb_hid/HIDDevice.cpp b/src/add-ons/kernel/drivers/input/usb_hid/HIDDevice.cpp
index 6dc451ad92..45aa7f5a99 100644
--- a/src/add-ons/kernel/drivers/input/usb_hid/HIDDevice.cpp
+++ b/src/add-ons/kernel/drivers/input/usb_hid/HIDDevice.cpp
@@ -221,7 +221,7 @@ HIDDevice::SendReport(HIDReport *report)
 
 
 ProtocolHandler *
-HIDDevice::ProtocolHandlerAt(uint32 index)
+HIDDevice::ProtocolHandlerAt(uint32 index) const
 {
 	if (index >= fProtocolHandlerCount)
 		return NULL;
diff --git a/src/add-ons/kernel/drivers/input/usb_hid/HIDDevice.h b/src/add-ons/kernel/drivers/input/usb_hid/HIDDevice.h
index 8c989c63da..714827783b 100644
--- a/src/add-ons/kernel/drivers/input/usb_hid/HIDDevice.h
+++ b/src/add-ons/kernel/drivers/input/usb_hid/HIDDevice.h
@@ -22,26 +22,26 @@ public:
 								~HIDDevice();
 
 			void				SetParentCookie(int32 cookie);
-			int32				ParentCookie() { return fParentCookie; };
+			int32				ParentCookie() const { return fParentCookie; }
 
-			status_t			InitCheck() { return fStatus; };
+			status_t			InitCheck() const { return fStatus; }
 
-			bool				IsOpen() { return fOpenCount > 0; };
+			bool				IsOpen() const { return fOpenCount > 0; };
 			status_t			Open(ProtocolHandler *handler, uint32 flags);
 			status_t			Close(ProtocolHandler *handler);
 
 			void				Removed();
-			bool				IsRemoved() { return fRemoved; };
+			bool				IsRemoved() const { return fRemoved; }
 
 			status_t			MaybeScheduleTransfer();
 
 			status_t			SendReport(HIDReport *report);
 
-			HIDParser *			Parser() { return &fParser; };
-			ProtocolHandler *	ProtocolHandlerAt(uint32 index);
+			HIDParser *			Parser() { return &fParser; }
+			ProtocolHandler *	ProtocolHandlerAt(uint32 index) const;
 
 			// only to be used for the kernel debugger information
-			usb_pipe			InterruptPipe() { return fInterruptPipe; };
+			usb_pipe			InterruptPipe() const { return fInterruptPipe; }
 
 private:
 	static	void				_TransferCallback(void *cookie,