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-rw-r--r--cpp/src/validating_util.cc3
1 files changed, 2 insertions, 1 deletions
diff --git a/cpp/src/validating_util.cc b/cpp/src/validating_util.cc
index 084c09c..9356689 100644
--- a/cpp/src/validating_util.cc
+++ b/cpp/src/validating_util.cc
@@ -84,7 +84,8 @@ bool UnwrapHeader(const char* header_prefix,
void ValidatingUtil::Wrap(time_t timestamp, std::string* data) {
assert(data != NULL);
char timestamp_string[2 + 3 * sizeof timestamp];
- int size = std::sprintf(timestamp_string, "%ld", timestamp);
+ int size =
+ std::sprintf(timestamp_string, "%ld", static_cast<long>(timestamp));
assert(size > 0);
assert(size < sizeof timestamp_string);
(void)size;