diff --git a/vars b/vars
index 678324789e0eb2626dfba85c44b5ca0b5f699478..cf1c8a2e19ff5d040c31b17a2ccccec90ba8d2a6 100644
--- a/vars
+++ b/vars
@@ -43,7 +43,7 @@ images/extracted/:
 	echo '*' > $@.gitignore
 images/extracted/inclusion.tex: images/extracted/
 	printf '%s\n' '\externaldocument{$(BOOK)}' > $@
-	printf '%s\n' '\newcommand\bookTitle{$(TITLE)}' >> $@
+	printf '%s\n' '\newcommand\bookTitle{$(TITLE)}' | tr '_' ' ' >> $@
 
 $(DROSS):
 	mkdir $(DROSS)