diff --git a/latex/book/Makefile b/latex/book/Makefile
index 013f71d..8df6fdd 100644
--- a/latex/book/Makefile
+++ b/latex/book/Makefile
@@ -1,8 +1,6 @@
 NAME = book
 
-TEX = $(NAME).tex
-SRC = $(TEX)
-PDF = $(TEX:.tex=.pdf)
+PDF = $(NAME).pdf
 
 TEXMK = latexmk -lualatex -shell-escape -interaction=nonstopmode
 QPDF  = qpdf --linearize --replace-input
diff --git a/latex/document/Makefile b/latex/document/Makefile
index 29dea52..b1bd6b6 100644
--- a/latex/document/Makefile
+++ b/latex/document/Makefile
@@ -1,8 +1,6 @@
 NAME = document
 
-TEX = $(NAME).tex
-SRC = $(TEX)
-PDF = $(TEX:.tex=.pdf)
+PDF = $(NAME).pdf
 
 TEXMK = latexmk -lualatex -shell-escape -interaction=nonstopmode
 QPDF  = qpdf --linearize --replace-input
diff --git a/latex/exam/Makefile b/latex/exam/Makefile
index 3f8e790..861b46f 100644
--- a/latex/exam/Makefile
+++ b/latex/exam/Makefile
@@ -1,8 +1,6 @@
 NAME = test
 
-TEX = $(NAME).tex
-SRC = $(TEX)
-PDF = $(TEX:.tex=.pdf)
+PDF = $(NAME).pdf
 
 TEXMK = latexmk -lualatex -shell-escape -interaction=nonstopmode
 QPDF  = qpdf --linearize --replace-input
diff --git a/latex/presentation/Makefile b/latex/presentation/Makefile
index 237b014..90b5fc5 100644
--- a/latex/presentation/Makefile
+++ b/latex/presentation/Makefile
@@ -1,9 +1,7 @@
 NAME  = slides
 
-TEX = $(NAME).tex
-SRC = $(TEX)
-PDF = $(TEX:.tex=.pdf)
 PKG = projektor.sty
+PDF = $(NAME).pdf
 
 TEXMK = latexmk -lualatex -shell-escape -interaction=nonstopmode
 QPDF  = qpdf --linearize --replace-input