diff --git a/DryadVertex/VertexHost/system/channel/src/channelbufferhdfs.cpp b/DryadVertex/VertexHost/system/channel/src/channelbufferhdfs.cpp
index d2d326e..aa14a1d 100644
--- a/DryadVertex/VertexHost/system/channel/src/channelbufferhdfs.cpp
+++ b/DryadVertex/VertexHost/system/channel/src/channelbufferhdfs.cpp
@@ -1116,7 +1116,7 @@ void RChannelBufferHdfsWriter::WriteThread()
                     Size_t dataToWrite = entry->m_buffer->GetAvailableSize();
                     LogAssert(dataToWrite <= dataSize);
                     bool ret =
-                        wa.WriteBlock((char *)dataAddr, dataToWrite,
+                        wa.WriteBlock((char *)dataAddr, (long) dataToWrite,
                                       entry->m_flush);
                     if (ret)
                     {
diff --git a/DryadVertex/VertexHost/vertex/managedwrappervertex/ManagedWrapperVertex.cpp b/DryadVertex/VertexHost/vertex/managedwrappervertex/ManagedWrapperVertex.cpp
index 519329b..8e99b0b 100644
--- a/DryadVertex/VertexHost/vertex/managedwrappervertex/ManagedWrapperVertex.cpp
+++ b/DryadVertex/VertexHost/vertex/managedwrappervertex/ManagedWrapperVertex.cpp
@@ -102,7 +102,7 @@ BOOL ConvertCurrentDirToUNCPath(WCHAR *pwszNWShareName, WCHAR *pwszUncPath, DWOR
         if (dwCurrentDirLen == 0)
             break;
 
-        DWORD dwShareLocalPathLen = wcslen(pwszShareLocalPath);
+        DWORD dwShareLocalPathLen = (DWORD) wcslen(pwszShareLocalPath);
         
         if( dwShareLocalPathLen >= dwCurrentDirLen)     // current directory must be longer than share local path, otherwise something is off.
             break;