--- doc/op/Makefile.orig	2022-01-20 18:08:27 UTC
+++ doc/op/Makefile
@@ -12,7 +12,7 @@ PS2PDF_CMD=	ps2pdf
 PIC=		${PIC_CMD} -C
 EQNASCII=	${EQN_CMD} -C -Tascii
 EQNPS=		${EQN_CMD} -C -Tps
-ROFFASCII=	${ROFF_CMD} -Tascii ${MACROS}
+ROFFASCII=	${ROFF_CMD} -P-c -Tascii ${MACROS}
 ROFFNOSGR=	GROFF_NO_SGR=1 ${ROFFASCII}
 ROFFPS=		${ROFF_CMD} -Tps -mps ${MACROS}
 ULASCII=	${UL_CMD} -t dumb