--- a/contrib/mom/Makefile.sub	2014-11-04 02:38:35.502520534 -0600
+++ b/contrib/mom/Makefile.sub	2021-02-08 14:51:57.131553432 -0600
@@ -41,7 +41,7 @@
   GROFF_COMMAND_PREFIX= \
   GROFF_BIN_PATH="$(GROFF_BIN_PATH)" \
   PDFMOM_BIN_PATH="$(top_builddir)/src/devices/gropdf" \
-  $(PDFMOMBIN) $(FFLAG) $(TFLAG) $(KFLAG)
+  $(PERL) $(PDFMOMBIN) $(FFLAG) $(TFLAG) $(KFLAG)
 
 MAN7=\
   groff_mom.n