diff --git a/lib/cpp/Makefile.am b/lib/cpp/Makefile.am
index 668af0a..5206db8 100755
--- a/lib/cpp/Makefile.am
+++ b/lib/cpp/Makefile.am
@@ -17,6 +17,8 @@
 # under the License.
 #
 
+AUTOMAKE_OPTIONS = subdir-objects
+
 moc_%.cpp: %.h
 	$(QT_MOC) $(QT_CFLAGS) $< -o $@