1 files changed, 1 insertions, 1 deletions
diff --git a/util/logging.cc b/util/logging.cc
index ca6b324403..db6160c8f1 100644
--- a/util/logging.cc
+++ b/util/logging.cc
@@ -49,7 +49,7 @@ bool ConsumeDecimalNumber(Slice* in, uint64_t* val) {
   uint64_t v = 0;
   int digits = 0;
   while (!in->empty()) {
-    char c = (*in)[0];
+    unsigned char c = (*in)[0];
     if (c >= '0' && c <= '9') {
       ++digits;
       const int delta = (c - '0');