CompressedFlags Usage

I see in CharacterMovementComponent.h:

enum CompressedFlags
		FLAG_JumpPressed	= 0x01,	// Jump pressed
		FLAG_WantsToCrouch	= 0x02,	// Wants to crouch
		FLAG_Reserved_1		= 0x04,	// Reserved for future use
		FLAG_Reserved_2		= 0x08,	// Reserved for future use
		// Remaining bit masks are available for custom flags.

But in UT sourcecode I see them using flags starting at 0x04. Should I be worried about my flags getting mangled by some future update that decides to use the reserved flags?