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-rw-r--r--src/tools/imgtool/stream.cpp2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/tools/imgtool/stream.cpp b/src/tools/imgtool/stream.cpp
index 417a33ed8b1..3bb57c87223 100644
--- a/src/tools/imgtool/stream.cpp
+++ b/src/tools/imgtool/stream.cpp
@@ -373,7 +373,7 @@ UINT64 stream_transfer(imgtool_stream *dest, imgtool_stream *source, UINT64 sz)
UINT64 readsz;
char buf[1024];
- while(sz && (readsz = stream_read(source, buf, std::min(sz, sizeof(buf)))))
+ while(sz && (readsz = stream_read(source, buf, std::min(sz, UINT64(sizeof(buf))))))
{
stream_write(dest, buf, readsz);
sz -= readsz;