diff --git a/share/mk/bsd.symver.mk b/share/mk/bsd.symver.mk
index aa2fee2c649f..f20442f0a25f 100644
--- a/share/mk/bsd.symver.mk
+++ b/share/mk/bsd.symver.mk
@@ -1,46 +1,46 @@
 
 .if !target(__<bsd.symver.mk>__)
 __<bsd.symver.mk>__:
 
 .include <bsd.init.mk>
 
 # Generate the version map given the version definitions
 # and symbol maps.
 .if !empty(VERSION_DEF) && !empty(SYMBOL_MAPS)
 # Find the awk script that generates the version map.
 VERSION_GEN?=	version_gen.awk
 VERSION_MAP?=	Version.map
 
 CLEANFILES+=	${VERSION_MAP}
 
 # Compute the make's -m path.
 _mpath=
 _oarg=
 .for _arg in ${.MAKEFLAGS}
 .if ${_oarg} == "-m"
 _mpath+= ${_arg}
 .endif
 _oarg=  ${_arg}
 .endfor
 _mpath+= /usr/share/mk
 
 # Look up ${VERSION_GEN} in ${_mpath}.
 _vgen=
 .for path in ${_mpath}
 .if empty(_vgen)
 .if exists(${path}/${VERSION_GEN})
 _vgen=  ${path}/${VERSION_GEN}
 .endif
 .endif
 .endfor
 .if empty(_vgen)
 .error ${VERSION_GEN} not found in the search path.
 .endif
 
 # Run the symbol maps through the C preprocessor before passing
 # them to the symbol version generator.
 ${VERSION_MAP}: ${VERSION_DEF} ${_vgen} ${SYMBOL_MAPS}
-	cat ${SYMBOL_MAPS} | ${CPP} - - \
+	cat ${SYMBOL_MAPS} | ${CPP} ${CFLAGS} - - \
 	    | awk -v vfile=${VERSION_DEF} -f ${_vgen} > ${.TARGET}
 .endif	# !empty(VERSION_DEF) && !empty(SYMBOL_MAPS)
 .endif  # !target(__<bsd.symver.mk>__)