diff --git a/ANNOUNCE b/ANNOUNCE
index b3eb5ff66..037d75429 100644
--- a/ANNOUNCE
+++ b/ANNOUNCE
@@ -1,5 +1,5 @@
 
-Libpng 1.6.0beta31 - October 24, 2012
+Libpng 1.6.0beta31 - October 26, 2012
 
 This is not intended to be a public release.  It will be replaced
 within a few weeks by a public version or by another test version.
@@ -525,7 +525,8 @@ Version 1.6.0beta30 [October 24, 2012]
   Fixed build when using #define PNG_NO_READ_GAMMA in png_do_compose() in
     pngrtran.c (Domani Hannes).
 
-Version 1.6.0beta31 [October 24, 2012]
+Version 1.6.0beta31 [October 26, 2012]
+  Undid the erroneous change to vstudio/pngvalid build in libpng-1.6.0beta30.
 
 Send comments/corrections/commendations to png-mng-implement at lists.sf.net
 (subscription required; visit
diff --git a/CHANGES b/CHANGES
index a8d8d78e3..a7fad813a 100644
--- a/CHANGES
+++ b/CHANGES
@@ -4277,7 +4277,8 @@ Version 1.6.0beta30 [October 24, 2012]
   Fixed build when using #define PNG_NO_READ_GAMMA in png_do_compose() in
     pngrtran.c (Domani Hannes).
 
-Version 1.6.0beta31 [October 24, 2012]
+Version 1.6.0beta31 [October 26, 2012]
+  Undid the erroneous change to vstudio/pngvalid build in libpng-1.6.0beta30.
 
 Send comments/corrections/commendations to png-mng-implement at lists.sf.net
 (subscription required; visit
diff --git a/projects/vstudio/pngvalid/pngvalid.vcxproj b/projects/vstudio/pngvalid/pngvalid.vcxproj
index 31ab0e09a..84efc4d81 100644
--- a/projects/vstudio/pngvalid/pngvalid.vcxproj
+++ b/projects/vstudio/pngvalid/pngvalid.vcxproj
@@ -21,7 +21,7 @@
   <PropertyGroup Label="Globals">
     <ProjectGuid>{9B36B6FE-7FC0-434F-A71F-BBEF8099F1D8}</ProjectGuid>
     <Keyword>Win32Proj</Keyword>
-    <RootNamespace>pngunknown</RootNamespace>
+    <RootNamespace>pngvalid</RootNamespace>
   </PropertyGroup>
   <Import Project="$(VCTargetsPath)\Microsoft.Cpp.Default.props" />
   <Import Project="$(SolutionDir)\zlib.props" />
@@ -101,9 +101,9 @@
     </Link>
     <CustomBuildStep>
       <Message>Executing PNG validation program</Message>
-      <Command>"$(OutDir)pngunknown.exe" --strict --default --touch "$(IntDir)pngunknown.out" ../../../pngtest.png</Command>
-      <Outputs>$(IntDir)pngunknown.out</Outputs>
-      <Inputs>$(OutDir)pngunknown.exe</Inputs>
+      <Command>"$(OutDir)pngvalid.exe" --touch "$(IntDir)pngvalid.out"</Command>
+      <Outputs>$(IntDir)pngvalid.out</Outputs>
+      <Inputs>$(OutDir)pngvalid.exe</Inputs>
     </CustomBuildStep>
   </ItemDefinitionGroup>
   <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Debug Library|Win32'">
@@ -125,7 +125,6 @@
       <FunctionLevelLinking>false</FunctionLevelLinking>
       <BrowseInformation>true</BrowseInformation>
       <FloatingPointExceptions>false</FloatingPointExceptions>
-      <RuntimeLibrary>MultiThreadedDebugDLL</RuntimeLibrary>
     </ClCompile>
     <Link>
       <SubSystem>Console</SubSystem>
@@ -135,9 +134,9 @@
     </Link>
     <CustomBuildStep>
       <Message>Executing PNG validation program</Message>
-      <Command>"$(OutDir)pngunknown.exe" --strict --default --touch "$(IntDir)pngunknown.out" ../../../pngtest.png</Command>
-      <Outputs>$(IntDir)pngunknown.out</Outputs>
-      <Inputs>$(OutDir)pngunknown.exe</Inputs>
+      <Command>"$(OutDir)pngvalid.exe" --touch "$(IntDir)pngvalid.out"</Command>
+      <Outputs>$(IntDir)pngvalid.out</Outputs>
+      <Inputs>$(OutDir)pngvalid.exe</Inputs>
     </CustomBuildStep>
   </ItemDefinitionGroup>
   <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Release|Win32'">
@@ -170,9 +169,9 @@
     </Link>
     <CustomBuildStep>
       <Message>Executing PNG validation program</Message>
-      <Command>"$(OutDir)pngunknown.exe" --strict --default --touch "$(IntDir)pngunknown.out" ../../../pngtest.png</Command>
-      <Outputs>$(IntDir)pngunknown.out</Outputs>
-      <Inputs>$(OutDir)pngunknown.exe</Inputs>
+      <Command>"$(OutDir)pngvalid.exe" --touch "$(IntDir)pngvalid.out"</Command>
+      <Outputs>$(IntDir)pngvalid.out</Outputs>
+      <Inputs>$(OutDir)pngvalid.exe</Inputs>
     </CustomBuildStep>
   </ItemDefinitionGroup>
   <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Release Library|Win32'">
@@ -206,13 +205,13 @@
     </Link>
     <CustomBuildStep>
       <Message>Executing PNG validation program</Message>
-      <Command>"$(OutDir)pngunknown.exe" --strict --default --touch "$(IntDir)pngunknown.out" ../../../pngtest.png</Command>
-      <Outputs>$(IntDir)pngunknown.out</Outputs>
-      <Inputs>$(OutDir)pngunknown.exe</Inputs>
+      <Command>"$(OutDir)pngvalid.exe" --touch "$(IntDir)pngvalid.out"</Command>
+      <Outputs>$(IntDir)pngvalid.out</Outputs>
+      <Inputs>$(OutDir)pngvalid.exe</Inputs>
     </CustomBuildStep>
   </ItemDefinitionGroup>
   <ItemGroup>
-    <ClCompile Include="..\..\..\contrib\libtests\pngunknown.c" />
+    <ClCompile Include="..\..\..\contrib\libtests\pngvalid.c" />
   </ItemGroup>
   <Import Project="$(VCTargetsPath)\Microsoft.Cpp.targets" />
   <ImportGroup Label="ExtensionTargets">