diff --git a/intern/ghost/intern/GHOST_ContextMTL.mm b/intern/ghost/intern/GHOST_ContextMTL.mm
index 66da5873514..cb34a8ebc45 100644
--- a/intern/ghost/intern/GHOST_ContextMTL.mm
+++ b/intern/ghost/intern/GHOST_ContextMTL.mm
@@ -21,6 +21,7 @@
 #import <QuartzCore/QuartzCore.h>
 
 #include <cassert>
+#include <mutex>
 #include <vector>
 
 static const MTLPixelFormat METAL_FRAMEBUFFERPIXEL_FORMAT_EDR = MTLPixelFormatRGBA16Float;
@@ -121,6 +122,10 @@ GHOST_ContextMTL::GHOST_ContextMTL(const GHOST_ContextParams &context_params,
 
 GHOST_ContextMTL::~GHOST_ContextMTL()
 {
+  /* Multiple threads can release their own context at the same time. */
+  static std::mutex mutex;
+  std::scoped_lock lock(mutex);
+
   metalFree();
 
   if (owns_metal_device_) {