diff --git a/vs2015/terark-db/db-regex-test/db-regex-test.vcxproj b/vs2015/terark-db/db-regex-test/db-regex-test.vcxproj
index e0fff4d..c07ff15 100644
--- a/vs2015/terark-db/db-regex-test/db-regex-test.vcxproj
+++ b/vs2015/terark-db/db-regex-test/db-regex-test.vcxproj
@@ -132,7 +132,7 @@
   <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Release|x64'">
     <ClCompile>
       <WarningLevel>Level3</WarningLevel>
-      <PrecompiledHeader>Use</PrecompiledHeader>
+      <PrecompiledHeader>NotUsing</PrecompiledHeader>
       <Optimization>MaxSpeed</Optimization>
       <FunctionLevelLinking>true</FunctionLevelLinking>
       <IntrinsicFunctions>true</IntrinsicFunctions>