diff --git a/lib_acl_cpp/changes.txt b/lib_acl_cpp/changes.txt
index cab816a97..22828601d 100644
--- a/lib_acl_cpp/changes.txt
+++ b/lib_acl_cpp/changes.txt
@@ -1,6 +1,9 @@
 修改历史列表：
 
 -----------------------------------------------------------------------
+512) 2018.3.20
+512.1) bugfix: thread_cond.cpp 中的方法 wait 内部计算时间有误
+
 511) 2018.3.19
 511.1) feature: add redis_sentinel class
 
diff --git a/lib_acl_cpp/src/stdlib/thread_cond.cpp b/lib_acl_cpp/src/stdlib/thread_cond.cpp
index 1f13c8163..9b95157c3 100644
--- a/lib_acl_cpp/src/stdlib/thread_cond.cpp
+++ b/lib_acl_cpp/src/stdlib/thread_cond.cpp
@@ -90,7 +90,7 @@ bool thread_cond::wait(long long microseconds /* = -1 */)
 	gettimeofday(&tv, NULL);
 
 	struct timespec ts;
-	ts.tv_sec   = (time_t) (tv.tv_sec + microseconds) / SEC_TO_MIS;
+	ts.tv_sec   = (time_t) (tv.tv_sec + microseconds / SEC_TO_MIS);
 	long long n = (tv.tv_usec + microseconds % SEC_TO_MIS) * MIS_TO_NS;
 	ts.tv_nsec  = (long) n % SEC_TO_NS;
 	ts.tv_sec  += (long) n / SEC_TO_NS;
diff --git a/packaging/acl-libs.spec b/packaging/acl-libs.spec
index 172c3f5d2..0acffd692 100644
--- a/packaging/acl-libs.spec
+++ b/packaging/acl-libs.spec
@@ -1,4 +1,4 @@
-%define release_id 87
+%define release_id 88
 
 Summary:        The powerful c/c++ library and server framework
 Name:           acl-libs
@@ -135,6 +135,9 @@ fi
 
 %changelog
 
+* Mon Mar 20 2018 zhengshuxin@qiyi.com 3.3.0-88-20180320.10
+- fixed one bug in thread_cond::wait there was one problem when computing timeout
+
 * Thu Mar 15 2018 zhengshuxin@qiyi.com 3.3.0-87-20180315.14
 - move acl-master.json from acl-master to acl-tools