diff --git a/renderdoc/3rdparty/glslang/glslang/MachineIndependent/ShaderLang.cpp b/renderdoc/3rdparty/glslang/glslang/MachineIndependent/ShaderLang.cpp
index b8d0707e6..5e5c05818 100644
--- a/renderdoc/3rdparty/glslang/glslang/MachineIndependent/ShaderLang.cpp
+++ b/renderdoc/3rdparty/glslang/glslang/MachineIndependent/ShaderLang.cpp
@@ -85,7 +85,7 @@ int NumberOfClients = 0;
 #ifndef DISABLE_THREAD_SUPPORT
 std::mutex &init_lock()
 {
-  std::mutex *lock = new std::mutex;
+  static std::mutex *lock = new std::mutex;
   return *lock;
 }
 #endif