diff --git a/OpenEXR/IlmImf/ImfMultiPartOutputFile.cpp b/OpenEXR/IlmImf/ImfMultiPartOutputFile.cpp
index 12ee4f12ca..27add0c27f 100644
--- a/OpenEXR/IlmImf/ImfMultiPartOutputFile.cpp
+++ b/OpenEXR/IlmImf/ImfMultiPartOutputFile.cpp
@@ -498,7 +498,7 @@ MultiPartOutputFile::Data::writeChunkTableOffsets (vector<OutputPartData*> &part
 
         Int64 pos = os->tellp();
 
-        if (pos == Int64(-1))
+        if (pos == static_cast<Int64>(-1))
             IEX_NAMESPACE::throwErrnoExc ("Cannot determine current file position (%T).");
 
         parts[i]->chunkOffsetTablePosition = os->tellp();
diff --git a/OpenEXR/IlmImf/ImfOutputFile.cpp b/OpenEXR/IlmImf/ImfOutputFile.cpp
index d5034cb028..d30a55f270 100644
--- a/OpenEXR/IlmImf/ImfOutputFile.cpp
+++ b/OpenEXR/IlmImf/ImfOutputFile.cpp
@@ -255,7 +255,7 @@ writeLineOffsets (OPENEXR_IMF_INTERNAL_NAMESPACE::OStream &os, const vector<Int6
 {
     Int64 pos = os.tellp();
 
-    if (pos == Int64(-1))
+    if (pos == static_cast<Int64>(-1))
 	IEX_NAMESPACE::throwErrnoExc ("Cannot determine current file position (%T).");
     
     for (unsigned int i = 0; i < lineOffsets.size(); i++)