diff --git a/gst-libs/gst/video/Makefile.am b/gst-libs/gst/video/Makefile.am
index 9f54995173..567a1f8d47 100644
--- a/gst-libs/gst/video/Makefile.am
+++ b/gst-libs/gst/video/Makefile.am
@@ -19,6 +19,7 @@ libgstbadvideo_@GST_API_VERSION@include_HEADERS = \
 nodist_libgstbadvideo_@GST_API_VERSION@include_HEADERS = $(built_headers)
 
 libgstbadvideo_@GST_API_VERSION@_la_CFLAGS = \
+	-DGST_USE_UNSTABLE_API \
 	-I$(top_srcdir)/gst-libs \
 	-I$(top_builddir)/gst-libs \
 	$(GST_CFLAGS) $(ORC_CFLAGS) \
diff --git a/gst-libs/gst/video/gstvideoaggregator.h b/gst-libs/gst/video/gstvideoaggregator.h
index 9fa5071ae6..b9fd53164c 100644
--- a/gst-libs/gst/video/gstvideoaggregator.h
+++ b/gst-libs/gst/video/gstvideoaggregator.h
@@ -21,6 +21,11 @@
 #ifndef __GST_VIDEO_AGGREGATOR_H__
 #define __GST_VIDEO_AGGREGATOR_H__
 
+#ifndef GST_USE_UNSTABLE_API
+#warning "The Video library from gst-plugins-bad is unstable API and may change in future."
+#warning "You can define GST_USE_UNSTABLE_API to avoid this warning."
+#endif
+
 #include <gst/gst.h>
 #include <gst/video/video.h>
 #include <gst/base/gstaggregator.h>