diff --git a/src/preview.cpp b/src/preview.cpp
index 4e04cf37..2bd66c80 100644
--- a/src/preview.cpp
+++ b/src/preview.cpp
@@ -891,7 +891,7 @@ namespace {
                 bufferPos--;
             }
             for (int bufferPos = 2; bufferPos >= 0 && destPos < destSize; bufferPos--, destPos++) {
-                dest.pData_[destPos] = (buffer >> (bufferPos * 8)) & 0xFF;
+                dest.pData_[destPos] = (Exiv2::byte) (buffer >> (bufferPos * 8)) & 0xFF;
             }
         }
         return dest;