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-rw-r--r--libdevcore/UTF8.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/libdevcore/UTF8.h b/libdevcore/UTF8.h
index 2824d5bf..d6959f3e 100644
--- a/libdevcore/UTF8.h
+++ b/libdevcore/UTF8.h
@@ -33,7 +33,7 @@ namespace utf8
/// Validate an input for UTF8 encoding
/// @returns true if it is invalid and the first invalid position in invalidPosition
-bool validate(std::string const& _input, int& _invalidPosition);
+bool validate(std::string const& _input, size_t& _invalidPosition);
}