diff --git a/Makefile b/Makefile
index 0b84a1703..463528a92 100644
--- a/Makefile
+++ b/Makefile
@@ -296,7 +296,7 @@ datenspuren-2016-mp3.xml:
 	$(WGET) -O $@ https://media.ccc.de/c/ds2016/podcast/mp3.xml
 
 build/datenspuren/$(DS_YEAR)/schedule-%.raw.xml: content/static/datenspuren/$(DS_YEAR)/fahrplan/schedule/%.html scripts/hyphenate.sed $(DATESTAMP)
-	 sed scripts/hyphenate.sed < $< > $@
+	 sed -f scripts/hyphenate.sed < $< > $@
 build/datenspuren/$(DS_YEAR)/schedule-%.xml : VFLAGS_IN=$(VFLAGS) --html
 build/datenspuren/$(DS_YEAR)/schedule-%.xml : PFLAGS+=--html
 build/datenspuren/$(DS_YEAR)/schedule-%.xml : STYLE=xsl/datenspuren/frab2xml.xsl