diff --git a/dlls/winegstreamer/wg_format.c b/dlls/winegstreamer/wg_format.c
index 84163f1e5d7..b22581e7824 100644
--- a/dlls/winegstreamer/wg_format.c
+++ b/dlls/winegstreamer/wg_format.c
@@ -455,6 +455,8 @@ static GstCaps *wg_format_to_caps_h264(const struct wg_format *format)
         case eAVEncH264VProfile_444:  profile = "high-4:4:4"; break;
         default:
             GST_FIXME("H264 profile attribute %u not implemented.", format->u.h264.profile);
+            /* fallthrough */
+        case eAVEncH264VProfile_unknown:
             profile = NULL;
             break;
     }
@@ -481,6 +483,8 @@ static GstCaps *wg_format_to_caps_h264(const struct wg_format *format)
         case eAVEncH264VLevel5_2: level = "5.2"; break;
         default:
             GST_FIXME("H264 level attribute %u not implemented.", format->u.h264.level);
+            /* fallthrough */
+        case 0:
             level = NULL;
             break;
     }