diff --git a/modules/lua/lua_config.c b/modules/lua/lua_config.c
index eef9c97ed3..8a967dc5f2 100644
--- a/modules/lua/lua_config.c
+++ b/modules/lua/lua_config.c
@@ -174,7 +174,8 @@ static int cmd_log_at(lua_State *L, int level)
     lua_getinfo(L, "Sl", &dbg);
 
     msg = luaL_checkstring(L, 2);
-    ap_log_error(dbg.source, dbg.currentline, APLOG_MODULE_INDEX, level, 0, cmd->server, msg);
+    ap_log_error(dbg.source, dbg.currentline, APLOG_MODULE_INDEX, level, 0,
+                 cmd->server, "%s", msg);
     return 0;
 }
 
diff --git a/modules/lua/lua_request.c b/modules/lua/lua_request.c
index 92a0b2ba08..afa606df15 100644
--- a/modules/lua/lua_request.c
+++ b/modules/lua/lua_request.c
@@ -399,7 +399,8 @@ static int req_log_at(lua_State *L, int level)
     lua_getinfo(L, "Sl", &dbg);
 
     msg = luaL_checkstring(L, 2);
-    ap_log_rerror(dbg.source, dbg.currentline, APLOG_MODULE_INDEX, level, 0, r, msg);
+    ap_log_rerror(dbg.source, dbg.currentline, APLOG_MODULE_INDEX, level, 0,
+                  r, "%s", msg);
     return 0;
 }