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-rw-r--r--backends/rtlil/rtlil_backend.cc2
1 files changed, 1 insertions, 1 deletions
diff --git a/backends/rtlil/rtlil_backend.cc b/backends/rtlil/rtlil_backend.cc
index 1b11de5ec..b5163aefe 100644
--- a/backends/rtlil/rtlil_backend.cc
+++ b/backends/rtlil/rtlil_backend.cc
@@ -75,7 +75,7 @@ void RTLIL_BACKEND::dump_const(std::ostream &f, const RTLIL::Const &data, int wi
else if (str[i] == '\t')
f << stringf("\\t");
else if (str[i] < 32)
- f << stringf("\\%03o", str[i]);
+ f << stringf("\\%03o", (unsigned char)str[i]);
else if (str[i] == '"')
f << stringf("\\\"");
else if (str[i] == '\\')