Why does my release driver binary includes full path to source and pdb?

I am builing a release driver using XP DDK 2600 free build environment. The
driver binary includes a full path to the pdb and source files (to all
source files and not headers). I don not want these to be included into the
release build. Its fine if its a debug build. Drivers found user under
windows\system32\drivers doesnt include these info, I assume that these are
also built using the same DDK which I am using. Why is the difference? How
can I get rid of this? Thanks.

# Target name and type
TARGETNAME=Uucf1894
TARGETPATH=obj
TARGETTYPE=DRIVER

!IF "$(DDK_TARGET_OS)" == "WinXP" || "$(DDK_TARGET_OS)" == "Win2K"
# XP/Later DDK build env being used
!IF "$(DDKBUILDENV)" == "chk"
NTDEBUG=ntsd
NTDEBUGTYPE=both
!ELSE
NTDEBUG=ntsdnodbg
NTDEBUGTYPE=both
!ENDIF
!ELSE
# Win2k DDK build env being used
!IF "$(DDKBUILDENV)" == "checked"
NTDEBUG=ntsd
NTDEBUGTYPE=both
!ELSE
NTDEBUG=ntsdnodbg
NTDEBUGTYPE=both
!ENDIF
!ENDIF
# for assembly listings
USER_C_FLAGS = /Fc

# for PDB
USE_PDB=1

USE_MAPSYM=1
BROWSER_INFO=1

SOURCES=Uucf1894.cpp \
Uuioctl.cpp \
UuPwr.cpp \
Uucf1894.RC