diff --git a/plugins/lua/ts_lua_common.h b/plugins/lua/ts_lua_common.h
index dba8b7d77e0..628eb09dd68 100644
--- a/plugins/lua/ts_lua_common.h
+++ b/plugins/lua/ts_lua_common.h
@@ -91,8 +91,8 @@ typedef struct {
   char script[TS_LUA_MAX_SCRIPT_FNAME_LENGTH];
   void *conf_vars[TS_LUA_MAX_CONFIG_VARS_COUNT];
 
-  int _first : 1; // create current instance for 1st ts_lua_main_ctx
-  int _last : 1;  // create current instance for the last ts_lua_main_ctx
+  unsigned int _first : 1; // create current instance for 1st ts_lua_main_ctx
+  unsigned int _last : 1;  // create current instance for the last ts_lua_main_ctx
 
   int remap;
   int states;
@@ -160,10 +160,10 @@ typedef struct {
   ts_lua_http_ctx *hctx;
 
   int64_t to_flush;
-  int reuse : 1;
-  int recv_complete : 1;
-  int send_complete : 1;
-  int all_ready : 1;
+  unsigned int reuse : 1;
+  unsigned int recv_complete : 1;
+  unsigned int send_complete : 1;
+  unsigned int all_ready : 1;
 } ts_lua_http_intercept_ctx;
 
 #define TS_LUA_RELEASE_IO_HANDLE(ih)    \
diff --git a/plugins/lua/ts_lua_coroutine.h b/plugins/lua/ts_lua_coroutine.h
index 831066dc24b..b2fb722fb51 100644
--- a/plugins/lua/ts_lua_coroutine.h
+++ b/plugins/lua/ts_lua_coroutine.h
@@ -59,7 +59,7 @@ typedef struct async_item {
   void *data;   // private data
 
   async_clean cleanup; // cleanup function
-  int deleted : 1;
+  unsigned int deleted : 1;
 } ts_lua_async_item;
 
 ts_lua_async_item *ts_lua_async_create_item(TSCont cont, async_clean func, void *d, ts_lua_cont_info *ci);
diff --git a/plugins/lua/ts_lua_fetch.h b/plugins/lua/ts_lua_fetch.h
index 04c0d47a56c..c4b600cc4d8 100644
--- a/plugins/lua/ts_lua_fetch.h
+++ b/plugins/lua/ts_lua_fetch.h
@@ -30,8 +30,8 @@ typedef struct {
   TSIOBufferReader reader;
   TSFetchSM fch;
 
-  int over : 1;
-  int failed : 1;
+  unsigned int over : 1;
+  unsigned int failed : 1;
 } ts_lua_fetch_info;
 
 typedef struct fetch_multi_info {