diff --git a/OpenEXR/IlmImf/ImfDeepTiledInputFile.cpp b/OpenEXR/IlmImf/ImfDeepTiledInputFile.cpp
index 5cca1bbc5a..6be42cb784 100644
--- a/OpenEXR/IlmImf/ImfDeepTiledInputFile.cpp
+++ b/OpenEXR/IlmImf/ImfDeepTiledInputFile.cpp
@@ -582,7 +582,7 @@ TileBufferTask::execute ()
         // Uncompress the data, if necessary
         //
 
-        if (_tileBuffer->compressor && _tileBuffer->dataSize < Int64(sizeOfTile))
+        if (_tileBuffer->compressor && _tileBuffer->dataSize < static_cast<Int64>(sizeOfTile))
         {
             _tileBuffer->format = _tileBuffer->compressor->format();
 
@@ -605,7 +605,7 @@ TileBufferTask::execute ()
 	// sanity check data size: the uncompressed data should be exactly 
 	// 'sizeOfTile' (if it's less, the file is corrupt and there'll be a buffer overrun)
 	//
-        if(_tileBuffer->dataSize != sizeOfTile)
+        if (_tileBuffer->dataSize != static_cast<Int64>(sizeOfTile))
 	{
 		THROW (IEX_NAMESPACE::InputExc, "size mismatch when reading deep tile: expected " << sizeOfTile << "bytes of uncompressed data but got " << _tileBuffer->dataSize);
 	}
@@ -1800,7 +1800,7 @@ DeepTiledInputFile::readPixelSampleCounts (int dx1, int dx2,
                 // @TODO refactor the compressor code to ensure full 64-bit support.
                 //
 
-                Int64 compressorMaxDataSize = Int64(std::numeric_limits<int>::max());
+                Int64 compressorMaxDataSize = static_cast<Int64>(std::numeric_limits<int>::max());
                 if (dataSize         > compressorMaxDataSize ||
                     unpackedDataSize > compressorMaxDataSize ||
                     tableSize        > compressorMaxDataSize)
diff --git a/OpenEXR/IlmImf/ImfDwaCompressor.cpp b/OpenEXR/IlmImf/ImfDwaCompressor.cpp
index fb359aae8e..4eb4f06e54 100644
--- a/OpenEXR/IlmImf/ImfDwaCompressor.cpp
+++ b/OpenEXR/IlmImf/ImfDwaCompressor.cpp
@@ -742,7 +742,7 @@ DwaCompressor::LossyDctDecoderBase::execute ()
 
     for (int i = 0; i < _SSE_ALIGNMENT; ++i)
     {
-        if (((size_t)(rowBlockHandle + i) & _SSE_ALIGNMENT_MASK) == 0)
+        if ((reinterpret_cast<uintptr_t>(rowBlockHandle + i) & _SSE_ALIGNMENT_MASK) == 0)
             rowBlock[0] = (unsigned short *)(rowBlockHandle + i);
     }
 
@@ -1010,7 +1010,7 @@ DwaCompressor::LossyDctDecoderBase::execute ()
 
             for (int y = 8 * blocky; y < 8 * blocky + maxY; ++y)
             {
-                if ((size_t)_rowPtrs[comp][y] & _SSE_ALIGNMENT_MASK)
+                if (reinterpret_cast<uintptr_t>(_rowPtrs[comp][y]) & _SSE_ALIGNMENT_MASK)
                     fastPath = false;
             }
 
@@ -2820,7 +2820,7 @@ DwaCompressor::uncompress
                     //
                     // sanity check for buffer data lying within range
                     //
-                    if (cd->planarUncBufferEnd + dstScanlineSize - _planarUncBuffer[UNKNOWN] > _planarUncBufferSize[UNKNOWN] )
+                    if ((cd->planarUncBufferEnd + static_cast<size_t>(dstScanlineSize))  > (_planarUncBuffer[UNKNOWN] + _planarUncBufferSize[UNKNOWN]) )
                     {
                         throw Iex::InputExc("DWA data corrupt");
                     }
diff --git a/OpenEXR/IlmImf/ImfMisc.cpp b/OpenEXR/IlmImf/ImfMisc.cpp
index 7d69798e8c..b4b66573cf 100644
--- a/OpenEXR/IlmImf/ImfMisc.cpp
+++ b/OpenEXR/IlmImf/ImfMisc.cpp
@@ -1882,8 +1882,7 @@ getScanlineChunkOffsetTableSize(const Header& header)
     const Box2i &dataWindow = header.dataWindow();
 
     vector<size_t> bytesPerLine;
-    size_t maxBytesPerLine = bytesPerLineTable (header,
-                                                bytesPerLine);
+    bytesPerLineTable (header, bytesPerLine);
 
     int linesInBuffer = numLinesInBuffer ( header.compression() );
 
diff --git a/OpenEXR/IlmImf/ImfOpaqueAttribute.h b/OpenEXR/IlmImf/ImfOpaqueAttribute.h
index abea1bc21d..82f462fd71 100644
--- a/OpenEXR/IlmImf/ImfOpaqueAttribute.h
+++ b/OpenEXR/IlmImf/ImfOpaqueAttribute.h
@@ -105,7 +105,7 @@ class OpaqueAttribute: public Attribute
     virtual void		copyValueFrom (const Attribute &other);
 
 
-    const int                   dataSize() const { return _dataSize; }
+    int                         dataSize() const { return _dataSize; }
     const Array<char>&          data() const { return _data; }
         
   private: