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-rw-r--r--src/nix-log2xml/log2xml.cc2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/nix-log2xml/log2xml.cc b/src/nix-log2xml/log2xml.cc
index 6645dc500..e26fb0023 100644
--- a/src/nix-log2xml/log2xml.cc
+++ b/src/nix-log2xml/log2xml.cc
@@ -137,7 +137,7 @@ void Decoder::finishLine()
if (line[i] == '<') cout << "&lt;";
else if (line[i] == '&') cout << "&amp;";
else if (line[i] == '\r') ; /* ignore carriage return */
- else if (line[i] < 32 && line[i] != 9) cout << "&#xfffd;";
+ else if (line[i] >= 0 && line[i] < 32 && line[i] != 9) cout << "&#xfffd;";
else if (i + sz + 33 < line.size() &&
string(line, i, sz) == storeDir &&
line[i + sz + 32] == '-')