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-rw-r--r--build2/test/script/regex.cxx3
1 files changed, 2 insertions, 1 deletions
diff --git a/build2/test/script/regex.cxx b/build2/test/script/regex.cxx
index fe8bcb0..5e14e6e 100644
--- a/build2/test/script/regex.cxx
+++ b/build2/test/script/regex.cxx
@@ -341,7 +341,8 @@ namespace std
{
const char_type& c (*b++);
- *m++ = c.type () == line_type::special && build2::digit (c.special ())
+ *m++ = c.type () == line_type::special && c.special () >= 0 &&
+ build2::digit (static_cast<char> (c.special ()))
? digit
: 0;
}