diff --git a/Makefile b/Makefile
index 7d12a32..3c98477 100755
--- a/Makefile
+++ b/Makefile
@@ -50,10 +50,13 @@
 .PHONY: all clean
 
 
+MODULES:=$(shell $(FIND) modules -type f -name "*.xml" )
+
+
 all: xml2html.xsl xml2xhtml.xsl xml2latex.xsl xml2xelatex.xsl oracle-docs.xsl
 
 
-xml2html.xsl xml2latex.xsl xml2xelatex.xsl: format-master.xml xml2xslt.xsl oracle-docs.xsl Makefile
+xml2html.xsl xml2latex.xsl xml2xelatex.xsl: format-master.xml $(MODULES) xml2xslt.xsl oracle-docs.xsl Makefile
 	$(call xslt,$<,xml2xslt.xsl,$(call xslt_parameter,target-format,$(@:xml2%.xsl=%))) > $@