diff --git a/make-includes/build_lecture_rules.make b/make-includes/build_lecture_rules.make
index ad987c3..556cda8 100644
--- a/make-includes/build_lecture_rules.make
+++ b/make-includes/build_lecture_rules.make
@@ -144,8 +144,8 @@
 slides: $(SLIDES_PREREQS)
 
 $(SLIDES).pdf: $(SLIDES_IN).tex $(SLIDE_IMAGES) $(SLIDE_BACKGROUNDS) $(SLIDE_FILES)
-	$(LATEXCMD) -jobname=$(SLIDES) '\documentclass[$(LATEX_OPTS)]{lectureslides}\input{$(SLIDES_IN)}'
-	$(LATEXCMD) -jobname=$(SLIDES) '\documentclass[$(LATEX_OPTS)]{lectureslides}\input{$(SLIDES_IN)}'
+	$(LATEXCMD) -jobname=$(SLIDES) '\documentclass[$(LATEX_OPTS),$(FONT_SIZE),$(PAPER_SIZE)]{lectureslides}\input{$(SLIDES_IN)}'
+	$(LATEXCMD) -jobname=$(SLIDES) '\documentclass[$(LATEX_OPTS),$(FONT_SIZE),$(PAPER_SIZE)]{lectureslides}\input{$(SLIDES_IN)}'
 	$(LN_S) -f $@ $(SLIDES_IN).pdf
 
 else
@@ -182,8 +182,8 @@
 slides-notes: $(SLIDES_NOTES_PREREQS)
 
 slides-notes.pdf: $(SLIDES_IN).tex $(SLIDE_IMAGES) $(SLIDE_BACKGROUNDS) $(SLIDE_FILES)
-	$(LATEXCMD) -jobname=slides-notes '\documentclass[$(LATEX_OPTS),notes=onlyslideswithnotes]{lectureslides}\input{$(SLIDES_IN)}'
-	$(LATEXCMD) -jobname=slides-notes '\documentclass[$(LATEX_OPTS),notes=onlyslideswithnotes]{lectureslides}\input{$(SLIDES_IN)}'
+	$(LATEXCMD) -jobname=slides-notes '\documentclass[$(LATEX_OPTS),$(FONT_SIZE),$(PAPER_SIZE),notes=onlyslideswithnotes]{lectureslides}\input{$(SLIDES_IN)}'
+	$(LATEXCMD) -jobname=slides-notes '\documentclass[$(LATEX_OPTS),$(FONT_SIZE),$(PAPER_SIZE),notes=onlyslideswithnotes]{lectureslides}\input{$(SLIDES_IN)}'
 
 #
 # Build the slides with notes, 6-up.
@@ -227,8 +227,8 @@
 slides-combined: slides-combined.pdf
 
 slides-combined.pdf: $(SLIDES_IN).tex $(SLIDE_IMAGES) $(SLIDE_BACKGROUNDS)
-	$(LATEXCMD) -jobname=slides-combined '\documentclass[$(LATEX_OPTS),handout]{lectureslides}\input{$(SLIDES_IN)}'
-	$(LATEXCMD) -jobname=slides-combined '\documentclass[$(LATEX_OPTS),handout]{lectureslides}\input{$(SLIDES_IN)}'
+	$(LATEXCMD) -jobname=slides-combined '\documentclass[$(LATEX_OPTS),$(FONT_SIZE),$(PAPER_SIZE),handout]{lectureslides}\input{$(SLIDES_IN)}'
+	$(LATEXCMD) -jobname=slides-combined '\documentclass[$(LATEX_OPTS),$(FONT_SIZE),$(PAPER_SIZE),handout]{lectureslides}\input{$(SLIDES_IN)}'
 
 #
 # Build the complete combined document.