diff --git a/gst/isomp4/qtdemux.c b/gst/isomp4/qtdemux.c
index 19ecaaceaf..d89cfd041c 100644
--- a/gst/isomp4/qtdemux.c
+++ b/gst/isomp4/qtdemux.c
@@ -12473,6 +12473,7 @@ qtdemux_video_caps (GstQTDemux * qtdemux, QtDemuxStream * stream,
       g_snprintf (fourstr, 5, "%" GST_FOURCC_FORMAT, GST_FOURCC_ARGS (fourcc));
       s = g_strdup_printf ("video/x-gst-fourcc-%s", g_strstrip (fourstr));
       caps = gst_caps_new_empty_simple (s);
+      g_free (s);
       break;
     }
   }
@@ -12762,6 +12763,7 @@ qtdemux_audio_caps (GstQTDemux * qtdemux, QtDemuxStream * stream,
       g_snprintf (fourstr, 5, "%" GST_FOURCC_FORMAT, GST_FOURCC_ARGS (fourcc));
       s = g_strdup_printf ("audio/x-gst-fourcc-%s", g_strstrip (fourstr));
       caps = gst_caps_new_empty_simple (s);
+      g_free (s);
       break;
     }
   }
@@ -12822,6 +12824,7 @@ qtdemux_sub_caps (GstQTDemux * qtdemux, QtDemuxStream * stream,
       g_snprintf (fourstr, 5, "%" GST_FOURCC_FORMAT, GST_FOURCC_ARGS (fourcc));
       s = g_strdup_printf ("text/x-gst-fourcc-%s", g_strstrip (fourstr));
       caps = gst_caps_new_empty_simple (s);
+      g_free (s);
       break;
     }
   }