1 files changed, 1 insertions, 1 deletions

diff --git a/Makefile b/Makefile
index c50910f..e3fcccd 100644
--- a/Makefile
+++ b/Makefile
@@ -12,7 +12,7 @@ all: $(PDF)
 	$(TEX) $(TEXOPTS) $(basename $@)
 	$(TEX) $(TEXOPTS) $(basename $@)
 
-%.fmt: preamble.tex
+%.fmt: preamble.tex $(wildcard *.sty)
 	$(TEX) -ini -jobname="$(basename $@)" "&$(TEX) $<\dump"
 
 clean: