diff --git a/Makefile b/Makefile
index 92ae17c..c41e7ac 100644
--- a/Makefile
+++ b/Makefile
@@ -18,7 +18,7 @@ html: $(BUILD)/html/$(BOOKNAME).html
 
 $(BUILD)/pdf/$(BOOKNAME).pdf: $(TITLE) $(CHAPTERS)
 	mkdir -p $(BUILD)/pdf
-	docker run --rm --volume `pwd`:/data pandoc/latex:2.6 -f markdown-implicit_figures -o /data/$@ $^
+	docker run --rm --volume `pwd`:/data pandoc/latex:2.6 -f markdown-implicit_figures -H make-code-small.tex -o /data/$@ $^
 
 $(BUILD)/html/$(BOOKNAME).html: $(TITLE) $(CHAPTERS)
 	mkdir -p $(BUILD)/html
diff --git a/make-code-small.tex b/make-code-small.tex
new file mode 100644
index 0000000..7d54928
--- /dev/null
+++ b/make-code-small.tex
@@ -0,0 +1,5 @@
+% Hack to decrease font size in code blocks
+% Options for font size:
+% huge, LARGE,  Large, large, normalsize, small, footnotesize, scriptsize, tiny
+% Source: https://stackoverflow.com/questions/27000906/how-to-set-the-font-size-for-code-blocks-in-pandoc-markdown#comment78049604_27159300
+\renewenvironment{Shaded} {\footnotesize} {}