diff --git a/Makefile b/Makefile
index 2b7f6d6..e094b15 100755
--- a/Makefile
+++ b/Makefile
@@ -53,7 +53,7 @@
 MODULES:=$(shell $(FIND) modules -type f -name "*.xml" )
 
 
-all: xml2html.xsl xml2xhtml.xsl xml2latex.xsl xml2xelatex.xsl oracle-docs.xsl modules/paper_calendar_dates.xml
+all: xml2html.xsl xml2xhtml.xsl xml2latex.xsl xml2xelatex.xsl oracle-docs.xsl modules/paper-calendar-dates.xml
 
 
 xml2html.xsl xml2latex.xsl xml2xelatex.xsl: format-master.xml $(MODULES) xml2xslt.xsl oracle-docs.xsl Makefile
@@ -62,14 +62,14 @@
 
 # Since it seems impossible in XSLT to generate an xmlns attribute for the
 # <html> element, we have to add the attribute after the fact :(.
-xml2xhtml.xsl: format-master.xml $(MODULES) xml2xslt.xsl oracle-docs.xsl modules/paper_calendar_dates.xml Makefile
+xml2xhtml.xsl: format-master.xml $(MODULES) xml2xslt.xsl oracle-docs.xsl modules/paper-calendar-dates.xml Makefile
 	$(call xslt,$<,xml2xslt.xsl,$(call xslt_parameter,target-format,$(@:xml2%.xsl=%))) > $@
 
 
-format-master.xml: modules/paper_calendar_dates.xml
+format-master.xml: modules/paper-calendar-dates.xml
 
 
-modules/paper_calendar_dates.xml: generate_calendar_dates.php
+modules/paper-calendar-dates.xml: generate_calendar_dates.php
 	php $< > $@
 
 
@@ -78,4 +78,4 @@
 
 
 clean:
-	rm -f xml2html.xsl xml2xhtml.xsl xml2latex.xsl xml2xelatex.xsl oracle-docs.xsl modules/paper_calendar_dates.xml
+	rm -f xml2html.xsl xml2xhtml.xsl xml2latex.xsl xml2xelatex.xsl oracle-docs.xsl modules/paper-calendar-dates.xml