diff --git a/subprojects/gst-plugins-bad/ext/curl/gstcurlbasesink.c b/subprojects/gst-plugins-bad/ext/curl/gstcurlbasesink.c
index 9d232e846d..35f55a1df5 100644
--- a/subprojects/gst-plugins-bad/ext/curl/gstcurlbasesink.c
+++ b/subprojects/gst-plugins-bad/ext/curl/gstcurlbasesink.c
@@ -144,6 +144,7 @@ static void gst_curl_base_sink_wait_for_transfer_thread_to_send_unlocked
 static void gst_curl_base_sink_data_sent_notify (GstCurlBaseSink * sink);
 static void gst_curl_base_sink_wait_for_response (GstCurlBaseSink * sink);
 static void gst_curl_base_sink_got_response_notify (GstCurlBaseSink * sink);
+static void gst_curl_base_sink_transfer_thread_close (GstCurlBaseSink * sink);
 
 static void handle_transfer (GstCurlBaseSink * sink);
 static size_t transfer_data_buffer (void *curl_ptr, TransferBuffer * buf,
@@ -295,7 +296,7 @@ gst_curl_base_sink_transfer_thread_notify_unlocked (GstCurlBaseSink * sink)
   g_cond_signal (&sink->transfer_cond->cond);
 }
 
-void
+static void
 gst_curl_base_sink_transfer_thread_close (GstCurlBaseSink * sink)
 {
   GST_OBJECT_LOCK (sink);
diff --git a/subprojects/gst-plugins-bad/ext/curl/gstcurlbasesink.h b/subprojects/gst-plugins-bad/ext/curl/gstcurlbasesink.h
index afa6d5bad4..482fa2bf4f 100644
--- a/subprojects/gst-plugins-bad/ext/curl/gstcurlbasesink.h
+++ b/subprojects/gst-plugins-bad/ext/curl/gstcurlbasesink.h
@@ -111,7 +111,6 @@ GType gst_curl_base_sink_get_type (void);
 
 void gst_curl_base_sink_transfer_thread_notify_unlocked
     (GstCurlBaseSink * sink);
-void gst_curl_base_sink_transfer_thread_close (GstCurlBaseSink * sink);
 void gst_curl_base_sink_set_live (GstCurlBaseSink * sink, gboolean live);
 gboolean gst_curl_base_sink_is_live (GstCurlBaseSink * sink);