diff --git a/Makefile.am b/Makefile.am
index 65a4de7..0befda2 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -49,7 +49,12 @@ dist-hook: gen-ChangeLog gen-AUTHORS
 
 # Generate the ChangeLog file (with all entries since the switch to git)
 # and insert it into the directory we're about to use to create a tarball.
+if OS_WIN32
+.PHONY: gen-ChangeLog gen-AUTHORS nsis
+else
 .PHONY: gen-ChangeLog gen-AUTHORS
+endif
+
 gen-ChangeLog:
 	if test -d .git || test -d ../.git; then		\
 	  $(top_srcdir)/build-aux/gitlog-to-changelog		\
diff --git a/data/Makefile.am b/data/Makefile.am
index 3ab6190..15755a7 100644
--- a/data/Makefile.am
+++ b/data/Makefile.am
@@ -30,7 +30,7 @@ virt-viewer-$(VERSION).msi: virt-viewer.wxs deps.txt
 	     $< virt-viewer-files.wxs && \
 	rm -rf $$DESTDIR virt-viewer-files.wxs
 
-CLEANFILES =					\
+CLEANFILES +=					\
 	deps.txt				\
 	virt-viewer-$(VERSION).exe		\
 	virt-viewer-$(VERSION).msi		\