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-rw-r--r--fpga_interchange/fpga_interchange.cpp2
1 files changed, 1 insertions, 1 deletions
diff --git a/fpga_interchange/fpga_interchange.cpp b/fpga_interchange/fpga_interchange.cpp
index e5a8fc38..566524b6 100644
--- a/fpga_interchange/fpga_interchange.cpp
+++ b/fpga_interchange/fpga_interchange.cpp
@@ -37,7 +37,7 @@ static void write_message(::capnp::MallocMessageBuilder & message, const std::st
gzFile file = gzopen(filename.c_str(), "w");
NPNR_ASSERT(file != Z_NULL);
- NPNR_ASSERT(gzwrite(file, &bytes[0], bytes.size()) == bytes.size());
+ NPNR_ASSERT(gzwrite(file, &bytes[0], bytes.size()) == (int)bytes.size());
NPNR_ASSERT(gzclose(file) == Z_OK);
}