diff --git a/gst/dtmf/gstdtmfsrc.h b/gst/dtmf/gstdtmfsrc.h
index 1e341fdc4f..e1a9cdffba 100644
--- a/gst/dtmf/gstdtmfsrc.h
+++ b/gst/dtmf/gstdtmfsrc.h
@@ -50,7 +50,7 @@ typedef struct _GstDTMFSrcClass GstDTMFSrcClass;
  * The opaque #GstDTMFSrc data structure.
  */
 
-enum _GstDTMFEventType {
+static enum _GstDTMFEventType {
   DTMF_EVENT_TYPE_START,
   DTMF_EVENT_TYPE_STOP
 };