diff --git a/multimedia/gstreamermm/files/patch-gstreamer_gstreamermm_register.h b/multimedia/gstreamermm/files/patch-gstreamer_gstreamermm_register.h
new file mode 100644
index 000000000000..e7ca856ebb3b
--- /dev/null
+++ b/multimedia/gstreamermm/files/patch-gstreamer_gstreamermm_register.h
@@ -0,0 +1,11 @@
+--- gstreamer/gstreamermm/register.h.orig	2021-08-03 01:07:13 UTC
++++ gstreamer/gstreamermm/register.h
+@@ -111,7 +111,7 @@ register_mm_type(const gchar * type_name)
+      * system and whether the compiler is c++ or not. The g_once_init_*
+      * functions always take a gsize * though ... */
+     static volatile gsize gonce_data = 0;
+-    if (g_once_init_enter (&gonce_data)) {
++    if (g_once_init_enter ((unsigned long *)&gonce_data)) {
+         GTypeInfo info;
+ 
+         info.class_size = sizeof(GlibCppTypeClass);