diff --git a/extra/x265/enable512.diff b/extra/x265/enable512.diff
new file mode 100644
index 000000000..3b9a9759d
--- /dev/null
+++ b/extra/x265/enable512.diff
@@ -0,0 +1,27 @@
+This function is used on all architectures, not just X86.
+
+--- x265-2.9/source/common/cpu.cpp
++++ x265-2.9/source/common/cpu.cpp
+@@ -110,6 +110,11 @@
+     { "", 0 },
+ };
+ 
++bool detect512()
++{
++    return(enable512);
++}
++
+ #if X265_ARCH_X86
+ 
+ extern "C" {
+@@ -123,10 +128,6 @@
+ #pragma warning(disable: 4309) // truncation of constant value
+ #endif
+ 
+-bool detect512()
+-{
+-    return(enable512);
+-}
+ uint32_t cpu_detect(bool benableavx512 )
+ {
+