diff --git a/src/Makefile-gen.am b/src/Makefile-gen.am
index 89d863ed..db403ab2 100644
--- a/src/Makefile-gen.am
+++ b/src/Makefile-gen.am
@@ -12,7 +12,6 @@ nodist_bin_SCRIPTS =
 libexec_PROGRAMS =
 libexec_SCRIPTS =
 nobase_dist_template_DATA =
-DISTCLEANFILES =
 CLEANFILES =
 BUILT_SOURCES =
 
diff --git a/src/dbus/qt/Makefile.am b/src/dbus/qt/Makefile.am
index 614e934a..cdfe1bb8 100644
--- a/src/dbus/qt/Makefile.am
+++ b/src/dbus/qt/Makefile.am
@@ -49,8 +49,8 @@ CLEANFILES = $(BUILT_SOURCES) \
 	stamp-session \
 	stamp-connection
 
-DISTCLEANFILES = syncevolution-qt-dbus.pc
-EXTRA_DIST = syncevolution-qt-dbus.pc.in
+DISTCLEANFILES += syncevolution-qt-dbus.pc
+EXTRA_DIST += syncevolution-qt-dbus.pc.in
 pkgconfig_DATA = syncevolution-qt-dbus.pc
 pkgconfigdir = $(libdir)/pkgconfig