diff --git a/api/hip/hip_platform.cpp b/api/hip/hip_platform.cpp
index 1b8a7b5c96..3e70f6e539 100644
--- a/api/hip/hip_platform.cpp
+++ b/api/hip/hip_platform.cpp
@@ -166,6 +166,7 @@ extern "C" std::vector< std::pair<hipModule_t, bool> >* __hipRegisterFatBinary(c
 }
 
 void PlatformState::unregisterVar(hipModule_t hmod) {
+  amd::ScopedLock lock(lock_);
   auto it = vars_.begin();
   while (it != vars_.end()) {
     DeviceVar& dvar = it->second;