diff --git a/core/iwasm/libraries/debug-engine/debug_engine.h b/core/iwasm/libraries/debug-engine/debug_engine.h
index 015f20d7b..37d859aba 100644
--- a/core/iwasm/libraries/debug-engine/debug_engine.h
+++ b/core/iwasm/libraries/debug-engine/debug_engine.h
@@ -50,7 +50,7 @@ typedef struct WASMDebugExecutionMemory {
     uint32 current_pos;
 } WASMDebugExecutionMemory;
 
-typedef struct WASMDebugInstance {
+struct WASMDebugInstance {
     struct WASMDebugInstance *next;
     WASMDebugControlThread *control_thread;
     bh_list break_point_list;
@@ -71,7 +71,7 @@ typedef struct WASMDebugInstance {
      * during creating debug instance, and use a simple bump pointer allocator
      * to serve lldb's memory request */
     WASMDebugExecutionMemory exec_mem_info;
-} WASMDebugInstance;
+};
 
 typedef enum WASMDebugEventKind {
     BREAK_POINT_ADD,
diff --git a/core/iwasm/libraries/thread-mgr/thread_manager.h b/core/iwasm/libraries/thread-mgr/thread_manager.h
index 181851059..c84d3c021 100644
--- a/core/iwasm/libraries/thread-mgr/thread_manager.h
+++ b/core/iwasm/libraries/thread-mgr/thread_manager.h
@@ -20,7 +20,7 @@ extern "C" {
 typedef struct WASMDebugInstance WASMDebugInstance;
 #endif
 
-typedef struct WASMCluster {
+struct WASMCluster {
     struct WASMCluster *next;
 
     korp_mutex lock;
@@ -37,7 +37,7 @@ typedef struct WASMCluster {
 #if WASM_ENABLE_DEBUG_INTERP != 0
     WASMDebugInstance *debug_inst;
 #endif
-} WASMCluster;
+};
 
 void
 wasm_cluster_set_max_thread_num(uint32 num);
@@ -151,11 +151,11 @@ wasm_cluster_spread_custom_data(WASMModuleInstanceCommon *module_inst,
 #define IS_WAMR_STOP_SIG(signo) \
     ((signo) == WAMR_SIG_STOP || (signo) == WAMR_SIG_TRAP)
 
-typedef struct WASMCurrentEnvStatus {
+struct WASMCurrentEnvStatus {
     uint64 signal_flag : 32;
     uint64 step_count : 16;
     uint64 running_status : 16;
-} WASMCurrentEnvStatus;
+};
 
 WASMCurrentEnvStatus *
 wasm_cluster_create_exenv_status();