diff --git a/dlls/winegstreamer/gstdemux.c b/dlls/winegstreamer/gstdemux.c
index e8f65a0e6ed..2c9aafd7a6b 100644
--- a/dlls/winegstreamer/gstdemux.c
+++ b/dlls/winegstreamer/gstdemux.c
@@ -1713,6 +1713,7 @@ static HRESULT gstdecoder_source_get_media_type(struct gstdemux_source *pin,
             gst_caps_unref(caps);
             return S_OK;
         }
+        FreeMediaType(mt);
     }
 
     if (!strcmp(type, "video/x-raw") && index < ARRAY_SIZE(video_formats))