diff --git a/configure.ac b/configure.ac
index c3274bee1c..8311823eb9 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1282,6 +1282,7 @@ gst-libs/gst/floatcast/Makefile
 gst-libs/gst/gconf/Makefile
 gst-libs/gst/idct/Makefile
 gst-libs/gst/media-info/Makefile
+gst-libs/gst/mixer/Makefile
 gst-libs/gst/play/Makefile
 gst-libs/gst/resample/Makefile
 gst-libs/gst/riff/Makefile