diff --git a/ext/webrtcdsp/gstwebrtcdsp.h b/ext/webrtcdsp/gstwebrtcdsp.h
index e0e808f13e..12a9415f6f 100644
--- a/ext/webrtcdsp/gstwebrtcdsp.h
+++ b/ext/webrtcdsp/gstwebrtcdsp.h
@@ -28,7 +28,9 @@
 #include <gst/base/gstbasetransform.h>
 #include <gst/audio/audio.h>
 
+#ifndef GST_USE_UNSTABLE_API
 #define GST_USE_UNSTABLE_API
+#endif
 #include <gst/audio/gstplanaraudioadapter.h>
 
 G_BEGIN_DECLS
diff --git a/ext/webrtcdsp/gstwebrtcechoprobe.h b/ext/webrtcdsp/gstwebrtcechoprobe.h
index a8a8899075..ea7f721401 100644
--- a/ext/webrtcdsp/gstwebrtcechoprobe.h
+++ b/ext/webrtcdsp/gstwebrtcechoprobe.h
@@ -28,7 +28,9 @@
 #include <gst/base/gstbasetransform.h>
 #include <gst/audio/audio.h>
 
+#ifndef GST_USE_UNSTABLE_API
 #define GST_USE_UNSTABLE_API
+#endif
 #include <gst/audio/gstplanaraudioadapter.h>
 
 G_BEGIN_DECLS