diff --git a/neural_speed/application/main_run.cpp b/neural_speed/application/main_run.cpp
index 37ccf64ec..0a441d18a 100644
--- a/neural_speed/application/main_run.cpp
+++ b/neural_speed/application/main_run.cpp
@@ -141,7 +141,7 @@ int main(int argc, char** argv) {  // NOLINT
 
   model_context* ctx;
   g_ctx = &ctx;
-  if (dev_ctx == NULL) {
+  if (dev_ctx == nullptr) {
     params.n_gpu_layers = 0;
   }
   // load the model and apply lora adapter, if any