Index: Mk/bsd.port.mk
===================================================================
--- Mk/bsd.port.mk
+++ Mk/bsd.port.mk
@@ -2021,7 +2021,11 @@
 # Macro for doing in-place file editing using regexps
 REINPLACE_ARGS?=	-i.bak
 .if defined(DEVELOPER)
-REINPLACE_CMD?=	${SETENV} WRKSRC=${WRKSRC} REWARNFILE=${REWARNFILE} ${SCRIPTSDIR}/sed_checked.sh
+# Force -i.bak after REINPLACE_ARGS in case REINPLACE_ARGS has been switched to
+# include an -i extension that isn't .bak for some reason.  sed_checked.sh
+# requires the backup files to be .bak.
+REINPLACE_CMD?=	${SETENV} WRKSRC=${WRKSRC} REWARNFILE=${REWARNFILE} \
+    ${SCRIPTSDIR}/sed_checked.sh ${REINPLACE_ARGS} -i.bak
 .else
 REINPLACE_CMD?=	${SED} ${REINPLACE_ARGS}
 .endif