diff --git a/common/common.h b/common/common.h
index 03abb3b6e..d9a300271 100644
--- a/common/common.h
+++ b/common/common.h
@@ -80,8 +80,8 @@ struct gpt_params {
     int32_t yarn_orig_ctx         = 0;     // YaRN original context length
     float   defrag_thold          = -1.0f; // KV cache defragmentation threshold
 
-    ggml_backend_sched_eval_callback cb_eval;
-    void * cb_eval_user_data;
+    ggml_backend_sched_eval_callback cb_eval = nullptr;
+    void * cb_eval_user_data                 = nullptr;
 
     ggml_numa_strategy numa = GGML_NUMA_STRATEGY_DISABLED;