diff --git a/Makefile.am b/Makefile.am
index 3c1de92..f6d794f 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -15,7 +15,7 @@ pkgconfigdir = $(libdir)/pkgconfig
 
 if ENABLE_MAN
 cmis-client.1: doc/cmis-client.xml
-	$(DOCBOOK2MAN) $<
+	$(DOCBOOK2MAN) $< > $@
 
 man_MANS = cmis-client.1
 endif