diff --git a/Makefile b/Makefile
index 33256a9..14bde53 100644
--- a/Makefile
+++ b/Makefile
@@ -4,7 +4,8 @@ DOCUMENTS := $(patsubst src/%/main.tex,build/%.pdf,$(wildcard src/*/main.tex))
 all: $(DOCUMENTS)
 
 build/%.pdf: src/%/main.tex build/prepared
-	latexmk $<
+	TEXINPUTS=./lib/cel-slides-template-2025:$(dir $<):$$TEXINPUTS \
+	latexmk -outdir=build/$* $<
 	mv build/main.pdf $@
 
 build/prepared: