diff --git a/ewmh/Makefile.am b/ewmh/Makefile.am
index 488d006a987d67d60301b8bf0afeef72f4117e04..9c54e92efd6a6995be2155d014c3cd1c2b353a34 100644
--- a/ewmh/Makefile.am
+++ b/ewmh/Makefile.am
@@ -17,7 +17,7 @@ BUILT_SOURCES = ewmh.c xcb_ewmh.h
 CLEANFILES = $(BUILT_SOURCES)
 
 ewmh.c: ewmh.c.m4 atomlist.m4
-	$(AM_V_GEN)$(M4) -I$(srcdir) $< >$@
+	$(AM_V_GEN)$(M4) -I$(srcdir) ewmh.c.m4 >$@
 
 xcb_ewmh.h: xcb_ewmh.h.m4 atomlist.m4
-	$(AM_V_GEN)$(M4) -I$(srcdir) $< >$@
+	$(AM_V_GEN)$(M4) -I$(srcdir) xcb_ewmh.h.m4 >$@